Explore time-dependent events throughout the calendar year.
Compute the date and properties of an eclipse:
Get information about a meteor shower:
Learn about satellites, space probes, space missions and other technologies for exploring space.
Get information about a manned space mission:
Get information about a satellite:
Compute many different astrophysical concepts from stellar luminosity to cosmology.
Compute the orbital period of a massive body orbiting another:
Compute cosmological properties of the universe:
Explore various formulas for orbital and time‐based dynamics.
Compute the orbital period of a massive body orbiting another:
Interactively compute the orbital speed of a body:
Visualize the relation between the eccentric and true anomaly:
Discover many different static and time-dependent phenomena about the planets, moons, asteroids and comets.
Compute the location of a planet on a specified date:
Compute the location and other properties of a comet:
Examine a wide variety of data about planets outside our solar system.
Get information about an exoplanet:
Do computations using the properties of exoplanets:
Explore information about galaxies from multiple surveys, including the Messier, NGC and IC catalogs.
Compute the location and get properties of a galaxy:
Get a property of a galaxy:
Navigate through a wide range of properties for both open and globular star clusters.
Compute the location and get properties of a star cluster:
Locate a cluster at a specified time:
Gain clarity about clouds in space that include both emission and reflection nebulae.
Compute the location and get properties of a nebula:
Compare nebulae:
Investigate data about invisible astronomical radio sources.
Look up objects by name:
Look up objects by catalog number:
Delve into a diverse set of concepts, data and computations about stars throughout our galaxy.
Compute the location and get properties of a star:
Do computations with star properties:
Explore the sky with star charts or maps.
Generate a star chart:
Generate a star chart for a specified location:
Learn about astronavigation values to help chart your journey.
Find your way by celestial navigation:
Delve into black holes to learn about their properties, evolution and locations.
Compute the location and get properties of a stellar-mass black hole:
Generate a list of nearby black holes:
Calculate the properties of a theoretical black hole with a known mass: