## 2 Materials
\begin{table}
\begin{tabular}{c c c c c} \hline \hline  & **Local Time: 2017-12-28 00:00:00–2017-12-29 00:00:00 (UTC + 2) Cutoff 10\({}^{\circ}\)** & \\ \hline
**Initial Time** & **End Time** & **Number of Satellites** & **Visible Satellites** & **Period of Time** \\ \hline
00:00:00 & 03:30:00 & 2–4 & E \(<\) 5 & 03:30:00 \\
03:30:00 & 04:20:00 & 5 & E01, E07, E08, E24, E26 & 00:50:00 \\
04:20:00 & 04:40:00 & 6 & E01, E07, E08, E12, E24, E26 & 00:20:00 \\
04:40:00 & 04:50:00 & 5 & E07, E08, E1 \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & **Local Time: 2017-12-30 00:00:00–2018-01-01 00:00:00 (UTC + 2) Cutoff 10\({}^{\circ}\)** & \\ \hline
00:00:00 & 05:20:00 & 2 & E \(<\) 5 & 05:20:00 \\
05:20:00 & 05:50:00 & 5 & E01, E03, E05, E08, E26 & 00:30:00 \\
05:50:00 & 06:20:00 & 4 & E \(<\) 5 & 00:30:00 \\
06:20:00 & 06:50:00 & 5 & E01, E03, E07, E08, E26 & 00:30:00 \\
06:50:00 & 10:20:00 & 4 & E \(<\) 5 & 03:30:00 \\
10:20:00 & 10:30:00 & 5 & E02, E07, E08, E12, E26 & 00:10:00 \\
10:30:00 & 10:40:00 & 6 & E02, E07, E08, E12, E26, E30 & 00:10:00 \\
10:40:00 & 10:50:00 & 7 & E02, E07, E08, E12, E19, E26, E30 & 00:10:00 \\
10:50:00 & 11:50:00 & 6 & E02, E07, E12, E19, E26, E30 & 01:00:00 \\
11:50:00 & 12:40:00 & 4 & E \(<\) 5 & 00:50:00 \\
12:40:00 & 13:30:00 & 5 & E07, E11, E12, E19, E30 & 00:50:00 \\
13:30:00 & 13:40:00 & 4 & E \(<\) 5 & 00:10:00 \\
13:40:00 & 14:10:00 & 5 & E04, E11, E12, E19, E30 & 00:30:00 \\
14:10:00 & 18:40:00 & 3 & E \(<\) 5 & 04:30:00 \\
18:40:00 & 19:10:00 & 5 & E01, E04, E05, E09, E26 & 00:30:00 \\
19:10:00 & 20:00:00 & 6 & E01, E04, E05, E09, E24, E26 & 00:50:00 \\
20:00:00 & 21:00:00 & 5 & E01, E05, E09, E24, E26 & 01:00:00 \\
21:00:00 & 21:10:00 & 6 & E01, E05, E09, E12, E24, E26 & 00:10:00 \\
21:10:00 & 21:20:00 & 7 & E01, E03, E05, E09, E12, E24, E26 & 00:10:00 \\
21:20:00 & 21:50:00 & 6 & E01, E03, E05, E12, E24, E26 & 00:30:00 \\
21:50:00 & 22:20:00 & 5 & E03, E05, E12, E24, E26 & 00:30:00 \\
22:20:00 & 00:00:00 & 3 & E \(<\) 5 & 01:40:00 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Galileo satellites availability for the Day of Year: 365, 2017. \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & **Local Time: 2017-12-30 00:00:00–2018-01-01 00:00:00 (UTC + 2) Cutoff 10\({}^{\circ}\)** & \\ \hline
**Initial Time** & **End Time** & **Number of Satellites** & **Visible Satellites** & **Period of Time** \\ \hline
00:00:00 & 02:00:00 & 3–4 & E \(<\) 5 & 02:00:00 \\
02:00:00 & 02:30:00 & 5 & E02, E11, E12, E19, E24 & 00:30:00 \\
02:30:00 & 02:40:00 & 4 & E \(<\) 5 & 00:10:00 \\
02:40:00 & 02:50:00 & 5 & E02, E04, E11, E12, E19 & 00:10:00 \\
02:50:0  
The research carried out (Table 7) showed that the constellation of Galileo satellites allowed measurements for 18.75-49.31% in the following observation days. The problem of discontinuity in observations occurs for kinematic and static measurements. It appears when a new satellite constellation is being built until the full operational capability is completed. Discontinuities in observations also occur when using fully operational systems such as GPS and GLONASS but measurements are made under difficult observational conditions for example, in wooded areas or places where there are other obstacles limiting access to satellites. Such situations occur usually in the case of rapid static measurements [12] or measurements in urban canyons [13]. The discontinuity problem occur also in the case of Precise Point Positioning (PPP) using different GNSS [14]. The references considering discontinuities in satellite observations proposed by the reviewer were added as a source of additional valuable information.