As you see from the post dates, this blog is no longer maintained.


How far is Saturn from the Earth today?

This picture comes from this web page of Solar System Live, by John Walker, where you can "... lets you view the solar system in a variety of ways for any date between 4713 B.C. and A.D. 8000. An ephemeris can be displayed for any location on Earth and, given orbital elements in the form published in the IAU Circulars, the orbit and position of asteroids and comets can be plotted."

There are other interesting pages to visit on Mr. Walker's site: a direct link to the NASA image of Switzerland from Space,
where "Every day around 10 A.M. Universal Time a new planet is created using random parameters, and an image of it, as seen from the bridge from your approaching starship, is produced. Imagine yourself gazing down on another living world and wondering how its people had shaped their world, and the world her people.",
Your Sky
"the interactive planetarium of the Web. You can produce maps in the forms described below for any time and date, viewpoint, and observing location. If you enter the orbital elements of an asteroid or comet, Your Sky will compute its current position and plot it on the map. Each map is accompanied by an ephemeris for the Sun, Moon, planets, and any tracked asteroid or comet. A control panel permits customisation of which objects are plotted, limiting magnitudes, colour scheme, image size, and other parameters." and
Calendar Converter which "allows you to interconvert dates in a variety of calendars, both civil and computer-related. All calculations are done in JavaScript executed in your own browser; complete source code is embedded in or linked to this page, and you're free to download these files to your own computer and use them even when not connected to the Internet."