![]() ![]() (DST) rules for dates from 1967 through the present day in accordance with the Uniform Time Act of 1966 and subsequent legislation. 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. The times of the equinoxes mark the beginning of spring and fall. 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.Topocentric Configuration of Major Solar System Bodies.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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