Astronomy Tools

Pick any past or future date. Get the phase, the percent lit, the Moon's age in days, and the next new, quarter, and full moons.

Enter your local cloud cover, humidity, Moon phase, and Bortle class to get a stargazing score, limiting magnitude, and night sky preview.

Enter a date, time, and location to get solar azimuth and elevation, the day's sun path, sunrise, sunset, day length, and shadow length.

Enter a location and date to get sunrise, sunset, solar noon, day length, each twilight phase, and the golden and blue hours.

Estimate high and low tide times for any day from one known reference high tide. Projects the lunar tidal cycle forward and back, drawing a tide curve, a live tide clock and a daily table for semi-diurnal, diurnal and mixed patterns.