Astronomy Tools

Calculate optimal eyepiece magnification for your telescope based on aperture and focal length.

User Intent: "What eyepiece do I need for my telescope?"

Convert light years to km, miles, AU, parsecs, and more. Visualize cosmic distances on a logarithmic scale from the Moon to the observable universe.

User Intent: "How far is a light year in km?"

Calculate your extraterrestrial age based on planetary orbital periods and discover your next cosmic birthday.

User Intent: "How old would I be on Mars?"

Calculate your weight on all 8 planets, the Moon, Pluto, and the Sun using NASA gravity data. Includes an interactive solar system SVG.

User Intent: "How much would I weigh on Mars?"

Find the best moon phase for planting, harvesting, and pruning. Full guide for all 8 phases, 29-day lunar calendar, and seasonal presets.

User Intent: "What moon phase is best for planting?"