約19年周期の地球の自転速度の揺れ？


![図1.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/226677/dbb0f262-4536-31a4-496e-59d7586a94d0.png)

# グリニッジ恒星時のデータ

1. [理科年表](https://official.rikanenpyo.jp/)プレミアムで グリニッジ恒星時 のデータ 1960 〜 2025 年(66年分)をダウンロード('25/1/14)
1. 前日との差分(秒)を作ると 236.5 か 236.6 らしい
   1960/1/1 は前日のデータがないので 236.5 とした
1. 236.5 または 236.6 ではなく前後と異質な値を発見
1. 紙データを電子化したときの入力ミスと思われるので、データを修正(概ね各一文字)
1. 前日との差分(秒)を再作成

## 修正情報

| 日付 | 誤 h m s | 修 h m s |  |
|:--|:-:|:-:|:--|
| <code>1960/11/12</code> | <code>03:24:20.4</code> | <code>03:24:29.4</code> | <code>20.4 → 29.4 (0 → 9)</code> |
| <code>1964/11/14</code> | <code>03:32:29.0</code> | <code>03:32:29.2</code> | <code>29.0 → 29.2 (0 → 9)</code> |
| <code>1967/03/03</code> | <code>10:40:10.6</code> | <code>10:40:19.6</code> | <code>10.6 → 19.6 (0 → 9)</code> |
| <code>1967/05/03</code> | <code>14:40:40.5</code> | <code>14:40:49.5</code> | <code>40.5 → 49.5 (0 → 9)</code> |
| <code>1967/11/08</code> | <code>03:55:08.6</code> | <code>03:05:58.6</code> | <code>3 55 8.6</code> ↓<br><code>3 5 58.6</code> |
| <code>1967/12/11</code> | <code>05:10:05.0</code> | <code>05:16:05.0</code> | <code>10&nbsp;&nbsp; → 16&nbsp;&nbsp; (0 → 6)</code> |
| <code>1968/01/21</code> | <code>07:57:48.9</code> | <code>07:57:43.9</code> | <code>48.9 → 43.9 (8 → 3)</code> |
| <code>1968/05/17</code> | <code>18:39:00.8</code> | <code>15:39:00.8</code> | <code>18&nbsp;&nbsp; → 15&nbsp;&nbsp; (8 → 5)</code> |
| <code>1968/09/05</code> | <code>22:50:38.7</code> | <code>22:56:38.7</code> | <code>50&nbsp;&nbsp; → 56&nbsp;&nbsp; (0 → 6)</code> |
| <code>1968/09/25</code> | <code>00:15:20.7</code> | <code>00:15:29.7</code> | <code>20.7 → 29.7 (0 → 9)</code> |
| <code>1968/10/08</code> | <code>01:06:44.0</code> | <code>01:06:44.9</code> | <code>44.0 → 44.9 (0 → 9)</code> |
| <code>1968/10/28</code> | <code>02:25:30.0</code> | <code>02:25:36.0</code> | <code>30.0 → 36.0 (0 → 6)</code> |
| <code>1968/10/31</code> | <code>02:34:25.7</code> | <code>02:37:25.7</code> | <code>34&nbsp;&nbsp; → 37&nbsp;&nbsp; (4 → 7)</code> |
| <code>1968/12/08</code> | <code>05:07:14.0</code> | <code>05:07:14.9</code> | <code>14.0 → 14.9 (0 → 9)</code> |
| <code>1970/01/10</code> | <code>07:06:24.4</code> | <code>07:16:24.4</code> | <code>7 6 24.4</code> ↓<br><code>7 16 24.4</code> |
| <code>1974/12/04</code> | <code>04:49:52.6</code> | <code>04:49:42.6</code> | <code>52.6 → 42.6 (5 → 4)</code> |
| <code>1977/03/05</code> | <code>10:50:03.6</code> | <code>10:50:30.6</code> | <code>10 50 3.6</code> ↓<br><code>10 50 30.6</code> |
| <code>1977/06/01</code> | <code>16:37:27.8</code> | <code>16:37:27.3</code> | <code>27.8 → 27.3 (8 → 3)</code> |
| <code>1979/03/29</code> | <code>12:13:12.6</code> | <code>12:23:12.6</code> | <code>13&nbsp;&nbsp; → 23&nbsp;&nbsp; (1 → 2)</code> |
| <code>1979/05/01</code> | <code>14:38:18.8</code> | <code>14:33:18.8</code> | <code>38&nbsp;&nbsp; → 33&nbsp;&nbsp; (8 → 3)</code> |
| <code>1979/05/21</code> | <code>15:22:09.9</code> | <code>15:52:09.9</code> | <code>22&nbsp;&nbsp; → 52&nbsp;&nbsp; (2 → 5)</code> |
| <code>1979/12/16</code> | <code>05:35:09.8</code> | <code>05:36:09.8</code> | <code>35&nbsp;&nbsp; → 36&nbsp;&nbsp; (5 → 6)</code> |
| <code>1980/07/16</code> | <code>19:35:26.1</code> | <code>19:35:56.1</code> | <code>26.1 → 56.1 (2 → 5)</code> |
| <code>1981/08/16</code> | <code>21:37:11.4</code> | <code>21:37:11.7</code> | <code>11.4 → 11.7 (4 → 7)</code> |
| <code>1981/11/14</code> | <code>03:22:01.5</code> | <code>03:32:01.5</code> | <code>22&nbsp;&nbsp; → 32&nbsp;&nbsp; (2 → 3)</code> |
| <code>1981/11/19</code> | <code>03:51:11.3</code> | <code>03:51:44.3</code> | <code>11.3 → 44.3 (1 → 4)</code> |
| <code>1982/03/29</code> | <code>12:24:16.8</code> | <code>12:24:16.5</code> | <code>16.8 → 16.5 (8 → 5)</code> |
| <code>1982/11/02</code> | <code>02:43:43.5</code> | <code>02:43:45.5</code> | <code>43.5 → 45.5 (3 → 5)</code> |
| <code>1984/03/24</code> | <code>12:16:35.8</code> | <code>12:06:35.8</code> | <code>12 16 35.8</code> ↓<br><code>12 6 35.8</code> |
| <code>1984/11/15</code> | <code>03:37:02.5</code> | <code>03:37:02.8</code> | <code>&nbsp;2.5 → &nbsp;2.8 (5 → 8)</code> |
| <code>1992/12/09</code> | <code>05:11:05.0</code> | <code>05:11:57.0</code> | <code>5 11 5.0</code> ↓<br><code>5 11 57.0</code> |

```diff:
diff -rU 0 orig/c160x03201.csv mod/c160x03201.csv
--- orig/c160x03201.csv	2025-01-17 18:35:17
+++ mod/c160x03201.csv	2025-01-17 18:41:57
@@ -14 +14 @@
-12,7 22 0.4,9 24 13.7,11 18 33.7,13 20 46.8,15 19 3.4,17 21 16.6,19 19 33.3,21 21 46.5,23 23 59.7,1 22 16.2,3 24 20.4,5 22 46.1
+12,7 22 0.4,9 24 13.7,11 18 33.7,13 20 46.8,15 19 3.4,17 21 16.6,19 19 33.3,21 21 46.5,23 23 59.7,1 22 16.2,3 24 29.4,5 22 46.1
diff -rU 0 orig/c164x03201.csv mod/c164x03201.csv
--- orig/c164x03201.csv	2025-01-17 18:35:45
+++ mod/c164x03201.csv	2025-01-17 18:41:57
@@ -16 +16 @@
-14,7 29 59.9,9 32 13.2,11 26 33.2,13 28 46.3,15 27 3.0,17 29 16.3,19 27 33.0,21 29 46.2,23 31 59.4,1 30 16.0,3 32 29.0,5 30 45.9
+14,7 29 59.9,9 32 13.2,11 26 33.2,13 28 46.3,15 27 3.0,17 29 16.3,19 27 33.0,21 29 46.2,23 31 59.4,1 30 16.0,3 32 29.2,5 30 45.9
diff -rU 0 orig/c167x03201.csv mod/c167x03201.csv
--- orig/c167x03201.csv	2025-01-17 18:36:07
+++ mod/c167x03201.csv	2025-01-17 18:41:57
@@ -5 +5 @@
-3,6 47 42.8,8 49 56.1,10 40 10.6,12 42 32.8,14 40 40.5,16 43 2.7,18 41 19.5,20 43 32.8,22 45 46.0,0 44 2.6,2 46 15.8,4 44 32.5
+3,6 47 42.8,8 49 56.1,10 40 19.6,12 42 32.8,14 40 49.5,16 43 2.7,18 41 19.5,20 43 32.8,22 45 46.0,0 44 2.6,2 46 15.8,4 44 32.5
@@ -10 +10 @@
-8,7 7 25.6,9 9 38.9,11 0 2.4,13 2 15.6,15 0 32.2,17 2 45.5,19 1 2.3,21 3 15.5,23 5 28.7,1 3 45.3,3 55 8.6,5 4 15.3
+8,7 7 25.6,9 9 38.9,11 0 2.4,13 2 15.6,15 0 32.2,17 2 45.5,19 1 2.3,21 3 15.5,23 5 28.7,1 3 45.3,3 5 58.6,5 4 15.3
@@ -13 +13 @@
-11,7 19 15.3,9 21 28.6,11 11 52.1,13 14 5.2,15 12 21.9,17 14 35.2,19 12 51.9,21 15 5.2,23 17 18.4,1 15 35.0,3 17 48.2,5 10 5.0
+11,7 19 15.3,9 21 28.6,11 11 52.1,13 14 5.2,15 12 21.9,17 14 35.2,19 12 51.9,21 15 5.2,23 17 18.4,1 15 35.0,3 17 48.2,5 16 5.0
diff -rU 0 orig/c168x03201.csv mod/c168x03201.csv
--- orig/c168x03201.csv	2025-01-17 18:36:22
+++ mod/c168x03201.csv	2025-01-17 18:41:57
@@ -7 +7 @@
-5,6 54 38.9,8 56 52.2,10 51 12.3,12 53 25.5,14 51 42.1,16 53 55.4,18 52 12.2,20 54 25.5,22 50 38.7,0 54 55.3,2 57 8.5,4 55 25.2
+5,6 54 38.9,8 56 52.2,10 51 12.3,12 53 25.5,14 51 42.1,16 53 55.4,18 52 12.2,20 54 25.5,22 56 38.7,0 54 55.3,2 57 8.5,4 55 25.2
@@ -10 +10 @@
-8,7 6 28.6,9 8 41.9,11 3 2.0,13 5 15.2,15 3 31.8,17 5 45.1,19 4 1.8,21 6 15.1,23 8 28.3,1 6 44.0,3 8 58.1,5 7 14.0
+8,7 6 28.6,9 8 41.9,11 3 2.0,13 5 15.2,15 3 31.8,17 5 45.1,19 4 1.8,21 6 15.1,23 8 28.3,1 6 44.9,3 8 58.1,5 7 14.9
@@ -19 +19 @@
-17,7 41 57.6,9 44 10.9,11 38 31.0,13 40 44.1,18 39 0.8,17 41 14.1,19 39 30.9,21 41 44.1,23 43 57.3,1 42 13.9,3 44 27.1,5 42 43.9
+17,7 41 57.6,9 44 10.9,11 38 31.0,13 40 44.1,15 39 0.8,17 41 14.1,19 39 30.9,21 41 44.1,23 43 57.3,1 42 13.9,3 44 27.1,5 42 43.9
@@ -23 +23 @@
-21,7 57 48.9,9 59 57.1,11 54 17.2,13 56 30.4,15 54 47.1,17 57 0.3,19 55 17.1,21 57 30.4,23 59 43.5,1 58 0.1,4 0 13.4,5 58 30.2
+21,7 57 43.9,9 59 57.1,11 54 17.2,13 56 30.4,15 54 47.1,17 57 0.3,19 55 17.1,21 57 30.4,23 59 43.5,1 58 0.1,4 0 13.4,5 58 30.2
@@ -27 +27 @@
-25,8 13 30.1,10 15 43.3,12 10 3.4,14 12 16.6,16 10 33.3,18 12 46.6,20 11 3.3,22 13 16.6,0 15 20.7,2 13 46.4,4 15 59.6,6 14 16.4
+25,8 13 30.1,10 15 43.3,12 10 3.4,14 12 16.6,16 10 33.3,18 12 46.6,20 11 3.3,22 13 16.6,0 15 29.7,2 13 46.4,4 15 59.6,6 14 16.4
@@ -30 +30 @@
-28,8 25 19.8,10 27 33.0,12 21 53.1,14 24 6.2,16 22 22.9,18 24 36.3,20 22 53.0,22 25 6.2,0 27 19.4,2 25 30.0,4 27 49.3,6 26 6.1
+28,8 25 19.8,10 27 33.0,12 21 53.1,14 24 6.2,16 22 22.9,18 24 36.3,20 22 53.0,22 25 6.2,0 27 19.4,2 25 36.0,4 27 49.3,6 26 6.1
@@ -33 +33 @@
-31,8 37 9.5,,12 33 42.7,,16 34 12.6,,20 34 42.7,22 36 55.9,,2 34 25.7,,6 37 55.7
+31,8 37 9.5,,12 33 42.7,,16 34 12.6,,20 34 42.7,22 36 55.9,,2 37 25.7,,6 37 55.7
diff -rU 0 orig/c170x03201.csv mod/c170x03201.csv
--- orig/c170x03201.csv	2025-01-17 18:36:39
+++ mod/c170x03201.csv	2025-01-17 18:41:57
@@ -12 +12 @@
-10,7 6 24.4,9 18 37.7,11 9 1.2,13 11 14.3,15 9 31.0,17 11 44.3,19 10 1.1,21 12 14.3,23 14 27.5,1 12 44.1,3 14 57.3,5 13 14.1
+10,7 16 24.4,9 18 37.7,11 9 1.2,13 11 14.3,15 9 31.0,17 11 44.3,19 10 1.1,21 12 14.3,23 14 27.5,1 12 44.1,3 14 57.3,5 13 14.1
diff -rU 0 orig/c174x03201.csv mod/c174x03201.csv
--- orig/c174x03201.csv	2025-01-17 18:36:59
+++ mod/c174x03201.csv	2025-01-17 18:41:57
@@ -6 +6 @@
-4,6 52 53.2,8 55 6.5,10 45 30.0,12 47 43.1,14 45 59.7,16 48 13.0,18 46 29.7,20 48 43.0,22 50 56.1,0 49 12.7,2 51 25.9,4 49 52.6
+4,6 52 53.2,8 55 6.5,10 45 30.0,12 47 43.1,14 45 59.7,16 48 13.0,18 46 29.7,20 48 43.0,22 50 56.1,0 49 12.7,2 51 25.9,4 49 42.6
diff -rU 0 orig/c177x03201.csv mod/c177x03201.csv
--- orig/c177x03201.csv	2025-01-17 18:37:14
+++ mod/c177x03201.csv	2025-01-17 18:41:57
@@ -3 +3 @@
-1,6 42 7.7,8 44 20.9,10 34 44.4,12 36 57.6,14 35 14.1,16 37 27.8,18 35 44.1,20 37 57.3,22 40 10.4,0 38 27.0,2 40 40.1,4 38 56.8
+1,6 42 7.7,8 44 20.9,10 34 44.4,12 36 57.6,14 35 14.1,16 37 27.3,18 35 44.1,20 37 57.3,22 40 10.4,0 38 27.0,2 40 40.1,4 38 56.8
@@ -7 +7 @@
-5,6 57 53.9,9 0 7.2,10 50 3.6,12 52 43.7,14 51 0.3,16 53 13.6,18 51 30.3,20 53 43.5,22 55 56.6,0 54 13.2,2 56 26.4,4 54 43.0
+5,6 57 53.9,9 0 7.2,10 50 30.6,12 52 43.7,14 51 0.3,16 53 13.6,18 51 30.3,20 53 43.5,22 55 56.6,0 54 13.2,2 56 26.4,4 54 43.0
diff -rU 0 orig/c179x03201.csv mod/c179x03201.csv
--- orig/c179x03201.csv	2025-01-17 18:37:28
+++ mod/c179x03201.csv	2025-01-17 18:41:57
@@ -3 +3 @@
-1,6 40 12.4,8 42 25.7,10 32 49.1,12 35 2.2,14 38 18.8,16 35 32.1,18 33 48.7,20 36 2.0,22 38 15.1,0 36 31.7,2 38 44.8,4 37 1.5
+1,6 40 12.4,8 42 25.7,10 32 49.1,12 35 2.2,14 33 18.8,16 35 32.1,18 33 48.7,20 36 2.0,22 38 15.1,0 36 31.7,2 38 44.8,4 37 1.5
@@ -18 +18 @@
-16,7 39 20.8,9 41 34.0,11 31 57.4,13 34 10.5,15 32 27.2,17 34 40.4,19 32 57.1,21 35 10.3,23 37 23.4,1 35 40.0,3 37 53.2,5 35 9.8
+16,7 39 20.8,9 41 34.0,11 31 57.4,13 34 10.5,15 32 27.2,17 34 40.4,19 32 57.1,21 35 10.3,23 37 23.4,1 35 40.0,3 37 53.2,5 36 9.8
@@ -23 +23 @@
-21,7 59 3.5,10 1 16.7,11 51 40.2,13 53 53.3,15 22 9.9,17 54 23.2,19 52 39.9,21 54 53.1,23 57 6.2,1 55 22.7,3 57 35.9,5 55 52.6
+21,7 59 3.5,10 1 16.7,11 51 40.2,13 53 53.3,15 52 9.9,17 54 23.2,19 52 39.9,21 54 53.1,23 57 6.2,1 55 22.7,3 57 35.9,5 55 52.6
@@ -31 +31 @@
-29,8 30 36.0,,12 13 12.6,14 25 25.7,16 23 42.4,18 25 55.6,20 24 12.3,22 26 25.5,0 28 38.6,2 26 55.2,4 29 8.4,6 27 25.1
+29,8 30 36.0,,12 23 12.6,14 25 25.7,16 23 42.4,18 25 55.6,20 24 12.3,22 26 25.5,0 28 38.6,2 26 55.2,4 29 8.4,6 27 25.1
diff -rU 0 orig/c180x03201.csv mod/c180x03201.csv
--- orig/c180x03201.csv	2025-01-17 18:37:45
+++ mod/c180x03201.csv	2025-01-17 18:41:57
@@ -18 +18 @@
-16,7 38 23.1,9 40 36.3,11 34 56.4,13 37 9.5,15 35 26.1,17 37 39.4,19 35 26.1,21 38 9.2,23 40 22.4,1 38 38.9,3 40 52.1,5 39 8.8
+16,7 38 23.1,9 40 36.3,11 34 56.4,13 37 9.5,15 35 26.1,17 37 39.4,19 35 56.1,21 38 9.2,23 40 22.4,1 38 38.9,3 40 52.1,5 39 8.8
diff -rU 0 orig/c181x03201.csv mod/c181x03201.csv
--- orig/c181x03201.csv	2025-01-17 18:38:26
+++ mod/c181x03201.csv	2025-01-17 18:41:57
@@ -16 +16 @@
-14,7 33 29.0,9 35 42.2,11 26 5.7,13 28 18.8,15 26 35.4,17 28 48.7,19 27 5.4,21 29 18.6,23 31 31.8,1 29 48.3,3 22 1.5,5 30 18.2
+14,7 33 29.0,9 35 42.2,11 26 5.7,13 28 18.8,15 26 35.4,17 28 48.7,19 27 5.4,21 29 18.6,23 31 31.8,1 29 48.3,3 32 1.5,5 30 18.2
@@ -18 +18 @@
-16,7 41 22.1,9 43 35.3,11 33 58.8,13 36 11.9,15 34 28.5,17 36 41.8,19 34 58.5,21 37 11.4,23 39 24.9,1 37 41.4,3 39 54.6,5 38 11.4
+16,7 41 22.1,9 43 35.3,11 33 58.8,13 36 11.9,15 34 28.5,17 36 41.8,19 34 58.5,21 37 11.7,23 39 24.9,1 37 41.4,3 39 54.6,5 38 11.4
@@ -21 +21 @@
-19,7 53 11.8,9 55 25.0,11 45 48.5,13 48 1.6,15 46 18.2,17 48 31.5,19 46 48.2,21 49 1.4,23 51 14.5,1 49 31.1,3 51 11.3,5 50 1.0
+19,7 53 11.8,9 55 25.0,11 45 48.5,13 48 1.6,15 46 18.2,17 48 31.5,19 46 48.2,21 49 1.4,23 51 14.5,1 49 31.1,3 51 44.3,5 50 1.0
diff -rU 0 orig/c182x03201.csv mod/c182x03201.csv
--- orig/c182x03201.csv	2025-01-17 18:38:49
+++ mod/c182x03201.csv	2025-01-17 18:41:57
@@ -4 +4 @@
-2,6 45 12.8,8 47 26.1,10 37 49.6,12 40 2.7,14 38 19.4,16 40 32.6,18 38 49.3,20 41 2.6,22 43 15.7,0 41 32.3,2 43 43.5,4 42 2.2
+2,6 45 12.8,8 47 26.1,10 37 49.6,12 40 2.7,14 38 19.4,16 40 32.6,18 38 49.3,20 41 2.6,22 43 15.7,0 41 32.3,2 43 45.5,4 42 2.2
@@ -31 +31 @@
-29,8 31 39.9,,12 24 16.8,14 26 29.7,16 24 46.4,18 26 59.6,20 25 16.3,22 27 29.5,0 29 42.7,2 27 59.3,4 30 12.5,6 28 29.2
+29,8 31 39.9,,12 24 16.5,14 26 29.7,16 24 46.4,18 26 59.6,20 25 16.3,22 27 29.5,0 29 42.7,2 27 59.3,4 30 12.5,6 28 29.2
diff -rU 0 orig/c184x03201.csv mod/c184x03201.csv
--- orig/c184x03201.csv	2025-01-17 18:39:11
+++ mod/c184x03201.csv	2025-01-17 18:41:57
@@ -17 +17 @@
-15,7 34 33.5,9 36 46.7,11 31 6.8,13 33 19.9,15 31 36.6,17 33 49.9,19 32 6.6,21 34 19.9,23 36 33.0,1 34 49.6,3 37 2.5,5 35 19.6
+15,7 34 33.5,9 36 46.7,11 31 6.8,13 33 19.9,15 31 36.6,17 33 49.9,19 32 6.6,21 34 19.9,23 36 33.0,1 34 49.6,3 37 2.8,5 35 19.6
@@ -26 +26 @@
-24,8 10 2.5,10 12 15.7,12 16 35.8,14 8 48.9,16 7 5.6,18 9 18.9,20 7 35.6,22 9 48.8,0 12 2.0,2 10 18.6,4 12 31.8,6 10 48.6
+24,8 10 2.5,10 12 15.7,12 6 35.8,14 8 48.9,16 7 5.6,18 9 18.9,20 7 35.6,22 9 48.8,0 12 2.0,2 10 18.6,4 12 31.8,6 10 48.6
diff -rU 0 orig/c192x03201.csv mod/c192x03201.csv
--- orig/c192x03201.csv	2025-01-17 18:39:35
+++ mod/c192x03201.csv	2025-01-17 18:41:57
@@ -11 +11 @@
-9,7 11 11.0,9 13 24.3,11 7 44.3,13 9 57.5,15 8 14.1,17 10 27.4,19 8 44.1,21 10 57.4,23 13 10.5,1 11 27.1,3 13 40.3,5 11 5.0
+9,7 11 11.0,9 13 24.3,11 7 44.3,13 9 57.5,15 8 14.1,17 10 27.4,19 8 44.1,21 10 57.4,23 13 10.5,1 11 27.1,3 13 40.3,5 11 57.0
```

# 前日との差分(秒)の年平均

グリニッジ恒星時の情報は 0.1 秒単位で表現されていますが、省略桁の部分は次の日に含まれていると考えることができます。ある程度の日数で平均すると 0.1 秒未満の平均速度が得られます。年単位で平均をとり、66年分の平均との差(百万分の一秒単位)が以下になります。これをグラフにしたものが先頭の図(MS-Excelで作成)です。

<sub>以下に表示している値はテキトーに作業した結果で、演算誤差等が大いに含まれています。</sub>

66年分の平均 = 236.55538225411706

| 年 | 前日差の年平均(秒) | 66年分平均との差<br>百万分の一秒単位 |
|:-:|--:|--:|
| <code>1960</code> | <code>236.55437158469942</code> | <code>-1010.669417638610000</code> |
| <code>1961</code> | <code>236.55452054794520</code> | <code> -861.706171860987500</code> |
| <code>1962</code> | <code>236.55479452054794</code> | <code> -587.733569119564000</code> |
| <code>1963</code> | <code>236.55479452054794</code> | <code> -587.733569119564000</code> |
| <code>1964</code> | <code>236.55546448087432</code> | <code>   82.226757257330970</code> |
| <code>1965</code> | <code>236.55561643835617</code> | <code>  234.184239104706650</code> |
| <code>1966</code> | <code>236.55616438356165</code> | <code>  782.129444587553700</code> |
| <code>1967</code> | <code>236.55589041095888</code> | <code>  508.156841817708500</code> |
| <code>1968</code> | <code>236.55628415300550</code> | <code>  901.898888429286700</code> |
| <code>1969</code> | <code>236.55643835616440</code> | <code> 1056.102047328977300</code> |
| <code>1970</code> | <code>236.55616438356165</code> | <code>  782.129444587553700</code> |
| <code>1971</code> | <code>236.55616438356165</code> | <code>  782.129444587553700</code> |
| <code>1972</code> | <code>236.55573770491802</code> | <code>  355.450800952894500</code> |
| <code>1973</code> | <code>236.55561643835617</code> | <code>  234.184239104706650</code> |
| <code>1974</code> | <code>236.55506849315070</code> | <code> -313.760966349718730</code> |
| <code>1975</code> | <code>236.55479452054794</code> | <code> -587.733569119564000</code> |
| <code>1976</code> | <code>236.55464480874318</code> | <code> -737.445373886203000</code> |
| <code>1977</code> | <code>236.55452054794520</code> | <code> -861.706171860987500</code> |
| <code>1978</code> | <code>236.55452054794520</code> | <code> -861.706171860987500</code> |
| <code>1979</code> | <code>236.55424657534246</code> | <code>-1135.678774602411000</code> |
| <code>1980</code> | <code>236.55464480874318</code> | <code> -737.445373886203000</code> |
| <code>1981</code> | <code>236.55479452054794</code> | <code> -587.733569119564000</code> |
| <code>1982</code> | <code>236.55534246575343</code> | <code>  -39.788363636716895</code> |
| <code>1983</code> | <code>236.55534246575343</code> | <code>  -39.788363636716895</code> |
| <code>1984</code> | <code>236.55573770491802</code> | <code>  355.450800952894500</code> |
| <code>1985</code> | <code>236.55643835616440</code> | <code> 1056.102047328977300</code> |
| <code>1986</code> | <code>236.55616438356165</code> | <code>  782.129444587553700</code> |
| <code>1987</code> | <code>236.55616438356165</code> | <code>  782.129444587553700</code> |
| <code>1988</code> | <code>236.55628415300550</code> | <code>  901.898888429286700</code> |
| <code>1989</code> | <code>236.55616438356165</code> | <code>  782.129444587553700</code> |
| <code>1990</code> | <code>236.55616438356165</code> | <code>  782.129444587553700</code> |
| <code>1991</code> | <code>236.55561643835617</code> | <code>  234.184239104706650</code> |
| <code>1992</code> | <code>236.55546448087432</code> | <code>   82.226757257330970</code> |
| <code>1993</code> | <code>236.55506849315070</code> | <code> -313.760966349718730</code> |
| <code>1994</code> | <code>236.55452054794520</code> | <code> -861.706171860987500</code> |
| <code>1995</code> | <code>236.55479452054794</code> | <code> -587.733569119564000</code> |
| <code>1996</code> | <code>236.55437158469942</code> | <code>-1010.669417638610000</code> |
| <code>1997</code> | <code>236.55424657534246</code> | <code>-1135.678774602411000</code> |
| <code>1998</code> | <code>236.55452054794520</code> | <code> -861.706171860987500</code> |
| <code>1999</code> | <code>236.55479452054794</code> | <code> -587.733569119564000</code> |
| <code>2000</code> | <code>236.55491803278690</code> | <code> -464.221330162217800</code> |
| <code>2001</code> | <code>236.55534246575343</code> | <code>  -39.788363636716895</code> |
| <code>2002</code> | <code>236.55561643835617</code> | <code>  234.184239104706650</code> |
| <code>2003</code> | <code>236.55589041095888</code> | <code>  508.156841817708500</code> |
| <code>2004</code> | <code>236.55601092896174</code> | <code>  628.674844676879700</code> |
| <code>2005</code> | <code>236.55616438356165</code> | <code>  782.129444587553700</code> |
| <code>2006</code> | <code>236.55643835616440</code> | <code> 1056.102047328977300</code> |
| <code>2007</code> | <code>236.55616438356165</code> | <code>  782.129444587553700</code> |
| <code>2008</code> | <code>236.55628415300550</code> | <code>  901.898888429286700</code> |
| <code>2009</code> | <code>236.55589041095888</code> | <code>  508.156841817708500</code> |
| <code>2010</code> | <code>236.55534246575343</code> | <code>  -39.788363636716895</code> |
| <code>2011</code> | <code>236.55534246575343</code> | <code>  -39.788363636716895</code> |
| <code>2012</code> | <code>236.55519125683060</code> | <code> -190.997286466654260</code> |
| <code>2013</code> | <code>236.55452054794520</code> | <code> -861.706171860987500</code> |
| <code>2014</code> | <code>236.55452054794520</code> | <code> -861.706171860987500</code> |
| <code>2015</code> | <code>236.55424657534246</code> | <code>-1135.678774602411000</code> |
| <code>2016</code> | <code>236.55464480874318</code> | <code> -737.445373886203000</code> |
| <code>2017</code> | <code>236.55424657534246</code> | <code>-1135.678774602411000</code> |
| <code>2018</code> | <code>236.55479452054794</code> | <code> -587.733569119564000</code> |
| <code>2019</code> | <code>236.55534246575343</code> | <code>  -39.788363636716895</code> |
| <code>2020</code> | <code>236.55519125683060</code> | <code> -190.997286466654260</code> |
| <code>2021</code> | <code>236.55589041095888</code> | <code>  508.156841817708500</code> |
| <code>2022</code> | <code>236.55589041095888</code> | <code>  508.156841817708500</code> |
| <code>2023</code> | <code>236.55616438356165</code> | <code>  782.129444587553700</code> |
| <code>2024</code> | <code>236.55628415300550</code> | <code>  901.898888429286700</code> |
| <code>2025</code> | <code>236.55643835616440</code> | <code> 1056.102047328977300</code> |


# Python スクリプト

```python:
#!/usr/bin/env python3

import os


def celltomsec(cell):
    h, m, s = cell.replace('  ', ' ').split(' ')
    return int(h) * 3600000 + int(m) * 60000 + int(float(s) * 10) * 100


def checkfilename(name):
    return (name[-4:] == '.csv' and
            name[:2] in ('c1', 'c2') and
            name[4:-4] in ('x03201', 'x02801'))


def read_csv(path, year):
    with open(path, encoding='sjis') as fp:
        lines = [[c.strip() for c in r.strip().split(',')] for r in fp.readlines()]
    return [[f'{year}/{month+1:02}/{day+1:02}', celltomsec(cell)]
            for day, line in enumerate(lines[2:])
            for month, cell in enumerate(line[1:]) if cell]


def read_data(srcdir):
    data = sorted(sum((
        read_csv(f'{srcdir}/{file}', 1800 + int(file[1:4]))
        for file in sorted(filter(checkfilename, os.listdir(srcdir)))), []))
    pms = None
    for day in data:
        cms = day[1]
        dms = 236_500 if pms is None else cms - pms + (0 if cms > pms else 86400_000)
        if dms not in (236_500, 236_600):
            raise Exception(f'{day[0]}: 前日のデータが無いか壊れてます : {dms}')
        day[1] = (day[1], dms)
        pms = cms
    return data


if __name__ == '__main__':
    import argparse
    import sys

    def main():
        parser = argparse.ArgumentParser()
        parser.add_argument('-D', '--directory', metavar='DIR', default='.')
        args = parser.parse_args()
        data = read_data(args.directory)

        yave = {}
        all = []
        for dt, val in data:
            y = int(dt[:4])
            vl = yave.get(y, [])
            vl.append(val[1])
            all.append(val[1])
            yave[y] = vl

        ave = sum(all) / len(all) / 1000
        print(ave)

        def avediff(l):
            a = sum(l) / len(l) / 1000
            return [a, (a - ave) * 1000_000]

        table = [[k, avediff(v)] for k,v in sorted(yave.items())]
        for y, d in table:
            print(f'{y}, {d[0]}, {d[1]}')

    sys.exit(main())
```

```console:実行結果
236.55538225411706
1960, 236.55437158469945, -1010.6694176101882
1961, 236.5545205479452, -861.7061718609875
1962, 236.55479452054794, -587.733569119564
1963, 236.55479452054794, -587.733569119564
1964, 236.5554644808743, 82.22675722890926
1965, 236.55561643835617, 234.18423910470665
1966, 236.55616438356165, 782.1294445875537
1967, 236.5558904109589, 508.1568418461302
1968, 236.55628415300546, 901.898888400865
1969, 236.55643835616436, 1056.1020473005556
1970, 236.55616438356165, 782.1294445875537
1971, 236.55616438356165, 782.1294445875537
1972, 236.55573770491802, 355.4508009528945
1973, 236.55561643835617, 234.18423910470665
1974, 236.55506849315069, -313.76096637814044
1975, 236.55479452054794, -587.733569119564
1976, 236.55464480874318, -737.445373886203
1977, 236.5545205479452, -861.7061718609875
1978, 236.5545205479452, -861.7061718609875
1979, 236.55424657534246, -1135.678774602411
1980, 236.55464480874318, -737.445373886203
1981, 236.55479452054794, -587.733569119564
1982, 236.55534246575343, -39.788363636716895
1983, 236.55534246575343, -39.788363636716895
1984, 236.55573770491802, 355.4508009528945
1985, 236.55643835616436, 1056.1020473005556
1986, 236.55616438356165, 782.1294445875537
1987, 236.55616438356165, 782.1294445875537
1988, 236.55628415300546, 901.898888400865
1989, 236.55616438356165, 782.1294445875537
1990, 236.55616438356165, 782.1294445875537
1991, 236.55561643835617, 234.18423910470665
1992, 236.5554644808743, 82.22675722890926
1993, 236.55506849315069, -313.76096637814044
1994, 236.5545205479452, -861.7061718609875
1995, 236.55479452054794, -587.733569119564
1996, 236.55437158469945, -1010.6694176101882
1997, 236.55424657534246, -1135.678774602411
1998, 236.5545205479452, -861.7061718609875
1999, 236.55479452054794, -587.733569119564
2000, 236.5549180327869, -464.2213301622178
2001, 236.55534246575343, -39.788363636716895
2002, 236.55561643835617, 234.18423910470665
2003, 236.5558904109589, 508.1568418461302
2004, 236.55601092896174, 628.6748446768797
2005, 236.55616438356165, 782.1294445875537
2006, 236.55643835616436, 1056.1020473005556
2007, 236.55616438356165, 782.1294445875537
2008, 236.55628415300546, 901.898888400865
2009, 236.5558904109589, 508.1568418461302
2010, 236.55534246575343, -39.788363636716895
2011, 236.55534246575343, -39.788363636716895
2012, 236.55519125683062, -190.99728643823255
2013, 236.5545205479452, -861.7061718609875
2014, 236.5545205479452, -861.7061718609875
2015, 236.55424657534246, -1135.678774602411
2016, 236.55464480874318, -737.445373886203
2017, 236.55424657534246, -1135.678774602411
2018, 236.55479452054794, -587.733569119564
2019, 236.55534246575343, -39.788363636716895
2020, 236.55519125683062, -190.99728643823255
2021, 236.5558904109589, 508.1568418461302
2022, 236.5558904109589, 508.1568418461302
2023, 236.55616438356165, 782.1294445875537
2024, 236.55628415300546, 901.898888400865
2025, 236.55643835616436, 1056.1020473005556
```

---

個人的には 236.55538225411706 が得られればよかったのですが、よく分からないものが出てきました…