Sternfinder
1
Star Finder (Celestial Globe)
1
Indicateur d’étoiles
Bedienungsanleitung
1
Operating Instructions
1
Mode d’emploi
© 2012 FPM Holding GmbH
24
Saint Peterburg
5
= 60° N
June 21
December 21
Sunrise
2.20
9.10
Sunset
21.30
14:40
Solar latitude at noon
+ 53°
+ 8°
Murmansk
5
= 69° N
June 21
December 21
Sunrise
Sunset
Sun remains in its
deepest position at 24
h
by approx. 2° above the
horizon (polar summer)
Sun not visible
(polar night)
Solar latitude at noon
+ 45°
Remark:
Because of the small scale of the star map, the above times are covered with
an average uncertainty of + 20
min
.
4.1.4 D
ETERMINATION OF THE
G
REENWICH
M
EAN
T
IME
(G.M.T.)
FROM THE STANDARD TIME
(S.T.)
The working out of the practical examples was based on the Greenwich hour
angle introduced in the Nautical Year Book of the GDR on January 1, 1953. All
values were expressed in degrees so that conversions from length into time
units are not necessary any longer.
As, for practical reasons, coherent economic areas of the earth are treated as
unitary time zones, the conversion of the respective standard time (S.T.) into
Greenwich Mean Time or universal time (U.T.) is necessary.
The geographic longitude of the observational place (
2
) is known. Observing
according to the standard time (S.T.), one founds the Greenwich Mean Time
(GMT) on the eastern longitude by subtracting the time difference (T.D.) from
the S.T.; and on the western longitude by adding the time difference to the S.T.
- T.D. east
G.M.T. = S.T.
+ T.D. west
