Moon Phase Calculator - Find the Moon phase and illumination percentage for any past or future date. See a realistic illustration of the lit Moon, its age in days, how far it is through the lunar cycle, and the exact dates of the next New Moon, First Quarter, Full Moon, and Last Quarter. Phases are computed with Jean Meeus' astronomical algorithm and can be mirrored for the Southern Hemisphere, with a step-by-step breakdown.

Star Visibility Calculator - Estimate how well the stars will be visible tonight from your location. Combine the Bortle light-pollution scale with cloud cover, humidity, and the Moon phase to get a 0-100 stargazing score, your naked-eye limiting magnitude, an estimate of how many stars you can see, and an animated live night-sky preview. Perfect for planning astrophotography, meteor showers, and dark-sky trips. New

Sun Position Calculator - Calculate the sun's azimuth (compass direction) and elevation (altitude above the horizon) for any date, time, and geographic location. See the sun plotted on an interactive sky dome, trace the full day's sun path, and get sunrise, solar noon, sunset, day length, shadow length, and the current solar phase with a step-by-step astronomical breakdown. New

Sunrise & Sunset Calculator - Calculate sunrise, sunset, solar noon, and day length for any location and date. See all the twilight phases (civil, nautical, astronomical), the photographer's golden hour and blue hour, how much the day length is changing each day, and an animated sun-path arc with a 24-hour day/night sky ribbon. Works worldwide from city presets or your own latitude and longitude.

Tide Time Calculator - Estimate the high and low tide times for any day from a single known reference high tide. The Tide Time Calculator projects the lunar tidal cycle forward and backward, drawing an interactive tide curve, a live tide clock, and a full daily tide table. Supports semi-diurnal, diurnal, and mixed tide patterns with a clear, step-by-step explanation of the Moon-driven timing. New