Designed for technical users who require high-precision astronomy data and understand general astronomy terms and concepts, as well as astronomical coordinate systems and time. Latest two years are in Government Documents Reference. Astronomical data required for marine navigation. America's oldest source of weather, folklore, gardening and other information. Controls allow you to set time and date, viewpoint, observing location, orbital elements to track an asteroid or comet, and a variety of other parameters.
P roduce maps of the sky 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. These works identify the precise locations of physical and cultural features such as landforms, bodies of water, cities and towns, and buildings. The official repository of information about U.S. geographic names. The federally recognized name of each feature described in the data base is identified, and references are made to a feature's location by state, county, and geographic coordinates.