From : ° ' N S latitude, and   ° ' W E longitude. When : Time : (hh:mm, local)   Date / / (mm/dd/yyyy)

With the Science U Planet Locator, you can look up where the planets will appear in the night sky at your time and location. Enter the necessary data below and then hit "Compute". You will get a table with the astronomical coordinates of all the planets. Click on a planet's name in the table for a picture of the planet in the sky.

Until the middle of this century, when the use of electonic navigation systems became widespread, sailing ships relied on tables of astronomical data to compute their courses and positions. The tables were called ephemerides, and many sailors still like to have an ephemeris on hand. One of the most popular is Reed's Nautical Almanac.