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| Sunrise and sunset calculator Sunrise/Sunset calculation for given latitude and longitude or for given city. Source: Almanac for Computers, 1990 published by Nautical Almanac Office United States Naval ObservatoryWashington, DC 20392 |
| Azimuth and solar elevation angle Calculation of azimuth and solar elevation angle by given the coordinates and time of observation. It's possible to input coordinates manually or by selecting from the directory of cities. |
| Julian days calculation Calculation of the Julian day for a given date, plus some information. |
| Sunrise and sunset time This online calculator is intended for sunrise and sunset time calculation for given place and date. The calculator algorithm is obtained from the great book of Oliver Montenbruck and Thomas Pfleger "Astronomy on the Personal Computer". |
| Shadow length Gives a vertical object shadow length for given coordinates and time. Also calculates shadow growth during whole day. |
| Angular size, linear size, and distance These calculators computes value of angular size or linear size or distance from the other two's |
| Sun position at a given date. Azimuth and elevation table. Calculation of azimuth and elevation of the sun above the horizon for a given position and time. Table with one hour increments. |
| Angle in degrees to time units and vice versa This online calculator converts angle between degrees and time units (i.e. hours). |
| Apparent length from angular size This online calculator converts angular size of distant object to its apparent length, or, in other words, the length of obstacle needed to block that distant object from view, if obstacle placed at some known distance before our eyes. |
| Indian calendars The calculators for Hindu date conversions |
| Time scales This calculator represents time in different time scales. |
| Declination and maximum altitude of the Sun above the horizon on a given date This online calculator calculates the declination of the Sun on a given date and the maximum altitude above the horizon on that day for a given latitude |
| Declination and maximum altitude of the Sun above the horizon on a given date This online calculator calculates the declination of the Sun on a given date and the maximum altitude above the horizon on that day for a given latitude |
| Dates of the beginning and end of polar night and polar day at a given latitude This online calculator calculates the start and end dates of polar night and polar day at a given latitude. The latitude of the observation site must be north of the north polar circle or south of the south polar circle. |
| Zero Shadow Day This online calculator calculates the dates of zero shadow days at a given latitude. The latitude of the observation site must be south of the Tropic of Cancer and north of the Tropic of Capricorn. |