Hildesheimer Volkshochschule e.V.

Kurs 2661H "Astronomie"

participating in the 'ASTRONOMY ON-LINE' project.

The following data (times) were used in calculating the difference in Longitude between Hildesheim and Paris with data obtained during the lunar eclipse on 27. September 1996. Due to the lack of real observational data (bad weather) the work was done with artificial, but realistic time recordings.
 

Event 
Date (day)
Hildesheim
Time (UT)
Paris
Time (UT)
Time difference
1. Sunset 1996-09-26 17:06 17:31
2. Moon entering shadow 1996-09-27 02:19 02:19
3. Moon leaving shadow 1996-09-26 03:29 03:29
4. Sunrise 1996-09-27 05:16 05:46
5. Time difference between 1. and 2. 09:13 08:42
6. Time difference between 3. and 4. 01:47 02:17
7. Time difference between Hildesheim and Paris (from line 5.) 00:29
8. Time difference between Hildesheim and Paris (from line 6.) 00:30
Longitude difference calculated from 7. 24h = 360 deg 00:29min.= 
7 15'
Longitude difference calculated from 8. 24h = 360 deg
00:30min.=
7 30'

It should be noted that the times given are in UT. The calculations would give the same result if local times are used for Hildesheim and Paris and only the time differences between the events are known (lines 5. and 6.) The true longitude difference between Paris and Hildesheim is 7 37'.

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This page created by Chris Plicht