FOV calculator

Simulate the Field of view with different telescopes, cameras and eyepieces

Moon Calculator

View the Moon phase, position and libration

Planetary orbit info

View where the planets are in their orbits relative to Earth

Jupiter moon positions

View the positions of the Galilean moons around Jupiter

Angle of Saturn's rings

View the angle of Saturn's rings

Planet size and viewing info

View the relative sizes of planets

Astronomy Equipment Database

Database of telescopes, cameras, eyepieces and binoculars.

Messier Catalogue

110 bright galaxies, nebulae and star clusters