Evening public ledger. [volume] (Philadelphia [Pa.]) 1914-1942, 1922-09-25
RETURN TO STANDARD TIME
DOESN'T MEAN TO SUN TIME
Old Sol Is Too Irregular in His Move.
ments to Control Our Clocks, So
We Have Invented a Sun
and Time Il by the Stars

- the workadny part Of the world now re-
| turns to the kind of time We used TO use
before the war Most people refer to it as
sun time. II seems TO be the general
! impression that we call it noon when the
! sun is directly overhead But we don't. The
! SaNages used td and primitive people still do,
and, OF course. that still is noon for nnvi-
gationol purnoses. But the sun is noto"i-
gave up trying to build watches and clocks
that would keep track of his vngaries.
! The whole world row sets It's watches
| and its clocks by sun that doesn't exist
! purely theoretical sun with perfectly rcgu-
! lar habitS--and the time that this theoreti:
cal sun Is supposed TO keep is what we call
! ,,standard'' time. II is that standard time
/ that we start to use in our business lives
| in Philadelphia today
WHEN the Naval Observatory at Wash.
| w ington sends out the noon signal today
and all the radio fans set their watches TO
! II o clock. the actual sun will be eight
I minutes and eleven seconds ahead Of them
! and II will have gained another nine seconds
: by the 10 o'clock signal tonight. Only four
! times in year do the real sun and this
supposititious sun come together. Next month
on the 4th--they will be sixteen min.
utes twenty and one fifth seconds
| apart, with the real sun ahead. and last
| February they were fourteen minutes,
twenty three and ninc-tenths seconds apart
with the true sun behind.
/ ! ~ Invention OF tnlS thooretlCdi, VI
! standard, sun may seem like lot Of use
| less trouble, but as q matter Of fact 1t
! would be great deal moro trouble TO Try
! 70 keep tim" by the actual sun. 1t ism I
! the suns fault it's the fault Uf the earth.
The earth rcvolvcS around on its axis with
! pretty fair regularity. Of course, it is this
! revolving that makes the sun apparently
! cross the heavens from east to west and If
the earth just stood still and revolved the
| sun would appear overhead regularly enough
| n q nIIr ole npLa nv
But. unfortunately. in addition to re-
! 0ovins on its axis, the earth also goes
.whirling around the sun in great big path
through space, and it takes i juS' about -, q
! this be so very bad If the earth would only
! whtrl around in a perfect circle. But It
/ won't. It's path is huge ellipse. and tho
| longest diameter Is some three million ml'eS
: greater than tho shorter one. This not only
! brings III complications. hut it becomes fur
| thcr complicated by tho law passed by Mr..
| Isaac Newton. to which Mr. Einstciu uas
! r"""ntIy moved an amendment. This law
! fore" tn" sun t" sIo" up in some PARTS OF
! itN trip and then !liTr; and make up for 'oSt
| time around other parts Of the curve.
| 4 ID to this the fact that the earth doesn't
~ stand upright it travels. but insists
! on lying over on It's side in tantaliHnc
! way and YOU will seq that there are lot uf
things T" bc considered in making Culcu-
! lT,i"nS ut just where tn" sun will be at any
! particular time on any particular day. II
! can he done and Is regularly done, but It's
no Job to intruSt ~ i wrist watch that you
| can buy for Sl.HS.
! 50, t" get away from all this difficulty,
| astronomers took pit! on the non scientific
! public and invented an ideal solar system
! IL which the earth stands upright aud re.
n"H' i III " r,ln,' , rIr'' i ar, u,',I '"c rE huh
If ronr,c, bring, tb" >Tnpo,j,ttinns sun d.
! rnr;lv overhead rcgulaylv at noon and gives
! ,rIu, vr rnII s,urdnrI timn \uh only
! tho lmor rarrgin, umI mates Of sLin., Who
PROBABLY uug!,; IT, stay h"llc anyway. have
| ,r ru,p, with tho yacnrc.. and rant8nhcroua.
| ne, of the real sun
-.
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! Iop must hr$t rc"'izc lnat there l. i