Halley's Comet

Halley's Comet only visits our part of the Solar System every 76 years so don't miss this once-in-a-lifetime opportunity to see the famous Comet!

This unique program provides a comprehensive and practical guide to the forthcoming apparition covering the period from January 1984 to December 1986 - you don't need to be an astronomer to enjoy it.

The program is user-friendly with ten screens of interactive or animated displays via one-touch key instructions. All the displays can be "COPY"ed.

The comet is plotted onto a machine code starmap or your "local horizon" for any chosen date/time/place. The position of the Sun and Moon are shown and the "sky" is coloured according to twilight/moonlight:

Flashing arrows warn if these* could spoil the view. The comet's coordinates in RA/Dec (19500 epoch) for use with starmaps, altitude/azimuth in the sky, magnitude and range from Earth and Sun are included.

Moon's Phase/Age/Position is accurate to within one day; adequate to judge moonlight conditions. The phase is named: New Moon, Evening (crescent), Gibbous, Full Moon or Morning (crescent) as appropriate.

Ranges

Date: INPUT range (for menu options 6, 7 & 8)
Date: 1984 Jan 1 to 1986 Dec 31
Time: 0-23hr; 0-59m (=GMT+1hr per 15 deg E long: -W)
Lat: 0 deg to +90 deg (London, England = 51 deg N)

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