Length of the Night
as an interval between the PM and AM moments
of Sun passing a given angular height (default -6°, for the ``civil night''):
The centre of Sun is at a place with coordinates [Lambda=16.6°, Phi=49.2°]
in an angular height of h =-6.0°
in the following morning and evening moments (given in UTC+ 2h):
year-month-day morning evening twilight decl. >mean night A-W
h:min / 1 min /1° /1min /1h /1°
2024- 5- 4 Saturda 4:50 20:51 36.7 16.18 3.2 7.98 33.4
5 Sunday 4:48 20:53 36.9 16.47 3.3 7.92 33.9
6 Monday 4:46 20:54 37.1 16.75 3.4 7.86 34.4
Average for 3 days
from 3 values is 4:48 20:53 36.9 16.46 3.3 7.92 33.9
Meaning of remaining columns:
Twilight is an interval to/from h=-0.8°
Declination of Sun is given for the moment of local mean noon,
>Mean says how much is the Sun ahead of the mean time,
Night is the time the Sun travels below h,
A-W is departure of solar azimuth from the west when at h afternoon.
This is a result of the programme
nights (available as a part of a package
pas_jh.zip (1.2 MB) --
the needed Pascal units themselves are unzipped within
this directory, the whole tree of my programmes within
this directory)
with a command line:
nights d04.05.2024 t09:36 l16.6 f49.2 ut2 h-6 n2 i1