Moon Phase Finder
Estimate the moon phase and illumination for any calendar date.
Use this tool directly in the browser, then move into Astronomy & Space for nearby workflows and supporting utilities.
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Telescope Magnification Comparator
Compare eyepiece magnification and field-of-view tradeoffs for one telescope setup.
Telescope Field of View Calculator
Estimate telescope magnification, true field of view, and exit pupil using aperture, focal length, and eyepiece data. It helps astronomy hobbyists compare setups before a night of observing.