Astronomy
Sun and moon positions, equinoxes and orbital arithmetic, computed from published ephemeris algorithms. 5 tools, including Moon Phase Calculator, Star Visibility Calculator, Sun Position Calculator and Sunrise & Sunset Calculator. All free, with no account and nothing to install.
Moon Phase CalculatorFind the moon phase, illumination and lunar age for any date and hemisphere.Star Visibility CalculatorEstimate how many stars you can see from light pollution, moon phase, clouds and humidity.Sun Position CalculatorCompute the sun's azimuth and elevation for any location, date and time.Sunrise & Sunset CalculatorFind sunrise, sunset, solar noon and day length for any location and date.Tide Time CalculatorEstimate the day's high and low tide times from a known reference tide and pattern.