![]() ![]() For more information on the API, please see the documentation page. The API returns data in JavaScript Object Notation (JSON) format for users who wish to manipulate data into a customized format. This data service uses one of our Application Programming Interfaces (APIs). ![]() If you set the "Account for US Daylight Saving Time" radio button on, the results will include a 1 hour offset to the given Time Zone hour if the requested date occurs during a DST period. The date when day and night are actually equal is called the equilux. (DST) rules for dates from 1967 through the present day in accordance with the Uniform Time Act of 1966 and subsequent legislation. In most regions, the day of the equinox is a bit longer than 12 hours. ![]() This service implements US daylight saving time The time zone field can accommodate up to five characters. You may enter 5.5 hours east of Greenwich for Time Zone hours field and set the Time Zone direction button according to the standard US time zone entered.įor locations that require it, you may enter the time zone in decimal hours. "Need a US Time Zone" button, the service will fill the The Seasons and the Earth's Orbit discusses how all of these phenomena relate. The times of apsides appear to vary more than those of the seasons. The page on Variation in Times of Perihelion and Aphelion explains why Therefore, the equinox in March is referred toĪs the Spring Equinox even though Fall is happening in the southern hemisphere. That said, the conventional method for naming the solstices andĮquinoxes is by the seasons of the northern hemisphere. While the northern hemisphere experiences summer, the southern Solstices mark the beginning of summer and winter. During summer the day of the solstice is the longest day of the year and during winter the day of the solstice is the shortest day of the year. Solstices occur on 20 th or 21 st June and 21 st or 22 nd December each year. The times of the equinoxes mark the beginning of spring and fall. During Solstices the tilt of the axis of the Earth (with respect to the Sun) is the maximum at 23° 26. Celestial Navigation Data for Assumed Position and Time.Earth's Seasons - Equinoxes, Solstices, Perihelion, and Aphelion.Topocentric Positions of Major Solar System Objects and Bright Stars.Geocentric Positions of Major Solar System Objects and Bright Stars.The 2022 winter solstice happens on Wednesday 21 December at 4:48 p.m. Topocentric Configuration of Major Solar System Bodies An illustration of Earth during the December solstice in 2018.Altitude and Azimuth of the Sun or Moon During One Day.Positions of Selected Celestial Objects.Duration of Daylight and Darkness Table for One Year.Rise/Set/Transit Times for Major Solar System Objects and Bright Stars.Table of Sunrise/Sunset, Moonrise/Moonset, or Twilight Times for an Entire Year. ![]()
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