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The Sky on Tuesday 21 January 2025
The Sun and ...
the Moon
Stockholm: Today the Sun rises at 08:20, 11 minutes earlier than one week ago. It sets at 15:39, 16 minutes later than one week ago.
Stockholm: Today the Moon rises at 00:14 and it sets at 09:51.
Future total and annular solar eclipses until 2040.
Map by Fred Espenak.
Astronomical events
Today at 06 CET: Moon 0.1° S of Spica. Occultation, visible in western and southern Africa and Madagascar
Today at 06 CET: Moon in apogee, distance 404298 km
Today at 15 CET: Pluto in conjunction with Sun
Today at 17 CET: Mars 2° S of Pollux
Today at 21:33 CET: Moon in 3rd quarter
Rise/set times for the Sun, Moon and Planets in 2025 from 22 different cities in Sweden.
Astronomical events this month and next month (in Swedish).
A few links:
SNIPPETS -- free sources in C, C++ and asm. Hundreds of routines.
Free C source for computing sunrise/set times, with comments.
Nonexistent celestial bodies
ICE
USNO's ICE (Interactive Computerized Ephemeris), which gives high-precision
planetary positions from 1800 to 2050, can be downloaded
here!
(size somewhat less than 1 MByte).
Info about ICE can be found
here!
ICE is an old MSDOS program which requires DOSbox to be run on a
modern Windows PC.
How to compute planetary positions
Tutorial on computing planetary positions
Computing rise/set times
Photometry/radiometry and astronomy
Time, GMT, UTC, TAI and GPS
ZC (Zodiacal Catalogue) online
The world's largest telescopes
TV broadcast systems worldwide
Halo ver 3 - freeware halo simulator
Computer simulation of a complex halo display as would be imaged by a
whole sky fisheye lens. The sun is 27 degrees above the horizon.
This image was generated by Version 3 of the
freeware program HALO, available for download at
https://old.atoptics.co.uk/halo/halfeat.htm. It runs under Windows.
Send mail to:
pausch@stjarnhimlen.se