About whatsupsky

whatsupsky answers one question in many ways: what is up in your sky, tonight, on any date, and in the calendars of every culture. Every answer is worked out for your own location.

How the numbers are calculated

• Sun, Moon and planets come from astronomy-engine (MIT licence), accurate to about one arcminute. The calculations run in your browser.
• Rise and set times use the standard horizon with atmospheric refraction. They can differ from other sites by a minute or two, and hills or buildings delay what you actually see.
• Places and time zones come from GeoNames (CC BY 4.0) and your browser's time zone database.
• Our rules are stated on each page, for example what counts as a supermoon (closer than 362,500 km) or a visible planet (at least 5 degrees up after twilight).

Astronomy, astrology and traditions

Astronomy is presented as fact. Astrology, folk names and religious calendars are presented as the traditions they are, respectfully and without predictions about health, money or fate. Where communities follow different rules, such as the date of a festival abroad, we show the options and suggest following your family, temple, church or mosque.

Privacy

Your location is stored only on your device. See the privacy page.