In collaboration with the Royal Observatory, Greenwich, HM Nautical Almanac Office operates a website providing celestial data to the public.

The site includes a sunrise and sunset time calculator, visibility predictions for the new crescent Moon, maps of forthcoming eclipses and information on UK public holidays.

Commercial enquiries are now handled by HMNAO directly. Please contact their team at hmnao@nao.rl.ac.uk or check the HMNAO services page

You can also try SunHeight.com – a site that can compute height and azimuth and the rise and set of solar system bodies at anytime and from anywhere on earth.