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The Sky on Friday 20 September 2024

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

Add one hour for Daylight Savings Time!
Stockholm: Today the Sun rises at 05:28, 16 minutes later than one week ago. It sets at 17:52, 21 minutes earlier than one week ago.
Stockholm: Today the Moon sets at 09:07 and it rises at 18:04.

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


Astronomical events

Tomorrow at 01 CET: Neptune in opposition
In 2 days at 12 CET: Moon 0,2° N of Pleiades (Alcyone). Occultation, visible in southern Canada, USA and Mexico
In 2 days at 13:44 CET: Autumn (September) Equinox
In 3 days at 07 CET: Moon 10° N of Aldebaran
In 12 days at 19:49 CET: New Moon. Annular solar eclipse, visible in Polynesia, Hawaii, parts of western Mexico, Galapagos Islands, southern half of South America, parts of Antarctica and South Georgia. Annular in southernmost Chile and southernmost Argentina. Not visible in Sweden.

Rise/set times for the Sun, Moon and Planets in 2024 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://old.atoptics.co.uk/halo/halfeat.htm. It runs under Windows.


Send mail to: pausch@stjarnhimlen.se