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Free Science & Geography Tools
Explore moon phases, eclipses, sun times, coordinates, map scales, and earth curvature calculations.
Astronomy and geography questions often need a date, a location, and a reliable calculation rather than a vague estimate. This collection covers lunar phases, eclipse searches, sunrise and sunset, golden hour, coordinates, map scales, and earth curvature. Astronomy results use a published engine and are shown in your browser's local time zone.
Moon Phase Calculator
Find the moon phase, illumination, and next phase dates for any day.
Open toolSolar Eclipse Calculator
Find upcoming solar eclipses and visibility for your location.
Open toolLunar Eclipse Calculator
Find lunar eclipse dates, type, duration, and visibility.
Open toolSunrise & Sunset Calculator
Calculate sunrise, sunset, daylight length, and twilight times.
Open toolGolden Hour Calculator
Find golden hour and blue hour times for photography.
Open toolStar Magnitude Calculator
Convert between stellar brightness, magnitude, and distance.
Open toolDistance Between Coordinates
Calculate the distance between two latitude and longitude points.
Open toolGPS Coordinate Converter
Convert decimal degrees to DMS and DMS back to decimal.
Open toolMap Scale Calculator
Convert map distances to real-world distances using a scale.
Open toolEarth Curvature Calculator
Estimate horizon distance and curvature drop over a distance.
Open tool