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The Sky on Saturday 21 June 2025

Sunspot data from Brussels The Sun and ... Om månenthe Moon

Add one hour for Daylight Savings Time!
Stockholm: Today the Sun rises at 02:31, 1 minutes earlier than one week ago. It sets at 21:08, 3 minutes later than one week ago.
Stockholm: Today the Moon sets at 16:13 and it rises at 23:59.

Future total and annular solar eclipses until 2040. Map by Fred Espenak.


Astronomical events

Today at 03:44 CET: June Solstice
Tomorrow at 10 CET: Moon 7° N of Venus
Tomorrow at 20 CET: Mercury 5° S of Pollux
In 2 days at 05 CET: Moon 0.6° N of Pleiades (Alcyone). Occultation, visible in westernmost Europe
In 2 days at 06 CET: Moon in perigee, distance 363178 km
In 2 days at 23 CET: Moon 11° N of Aldebaran
In 3 days at 16 CET: Jupiter in conjunction with Sun

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

Freeware Halo simulator

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://atoptics.org.uk/halo/halfeat.htm. It runs under Windows.


Send mail to: pausch@stjarnhimlen.se