Solar Day

Science / Weather / Solar Day: The complete rotation of the earth in relation to the sun. Although it varies, an average has determined a mean solar day of 24 hours. It is universally used for civil purposes.

Other Words for Day

Day Verb Synonyms: daytime, daylight, broad daylight, light of day
Day Noun Synonyms: time, hour, age, period, era, epoch, date, prime, heyday, lifetime

Solar Tide

Science / Tides and Currents / Solar Tide: (1) The part of the tide that is due to the tide-producing force of the Sun. (2) The observed tide in areas where the solar tide is dominant. This condition provides for phase repetition at about the MORE

Lunar Day

Science / Tides and Currents / Lunar Day: The time of the rotation of the Earth with respect to the Moon, or the interval between two successive upper transits of the Moon over the meridian of a place. The mean lunar day is approximately 24.8 MORE

Sidereal Day

Science / Astrology / Sidereal Day: Twenty-four sidereal hours equal to 23 hours, 56 minutes and 4 seconds of clock time. MORE


Science / Tides and Currents / Day: The period of rotation of the Earth. There are several kinds of days depending on whether the Sun, Moon, or other object or location is used as the reference for the rotation. See constituent day, lun MORE

Constituent Day

Science / Tides and Currents / Constituent Day: The time of the rotation of the Earth with respect to a fictitious celestial body repre senting one of the periodic elements in the tidal forces. It approximates in length the lunar or solar day and c MORE

Partial Day Treatment

Health / Dentistry / Partial Day Treatment: A program offered by appropriately-licensed facilities that includes either a day or evening treatment program, usually for mental health or substance abuse. MORE