The summer solstice marks the longest day and shortest night of the year in the Northern Hemisphere—the moment when the […]

The J2000.0 epoch is the standard reference point for modern astronomy, defined as January 1, 2000 at 12:00 TT (Terrestrial […]

On this page you'll find a live countdown showing exactly how many days are left until Halloween. If Halloween already […]

Enter numbers below to calculate the range — the difference between the largest and smallest values in your dataset. The […]

The winter solstice marks the shortest day and longest night of the year in the Northern Hemisphere, or the moment […]

This ratio to fraction calculator instantly converts any ratio to its fraction equivalent. Choose whether the ratio represents part of […]

Need to find the nth term or sum of a geometric sequence? This geometric sequence calculator computes any term, the […]

Shopping a sale? This discount calculator shows you the final price and how much you save when a percentage is […]

Below is an inverse cotangent calculator (or arccot calculator), which calculates an angle from the ratio from the cotangent function. […]

Excel stores dates as serial numbers counting days since January 1, 1900. This Excel Date calculator converts between Excel date […]