solar day


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Related to solar day: mean solar day, Apparent solar day

solar day

[′sō·lər ′dā]
(astronomy)
A time measurement, the duration of one rotation of the earth on its axis with respect to the sun; this may be a mean solar day or an apparent solar day as the reference is to the mean sun or apparent sun.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

solar day

solar dayclick for a larger image
i. The time the sun takes to rotate once on its axis with respect to fixed stars.
ii. The time between two successive solar transits of the same meridian (i.e., the time the earth takes to rotate once on its axis with respect to the mean or apparent sun).
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
However, the phase change ratio of PCM 2 is still under 0.2 at the end of the solar day.
Primitive humans experienced the solar day and slept under the phasic light of the moon.
It is longer than a 24-hour solar day, because the Moon revolves around the Earth in the same direction that the Earth rotates around her own axis;
However, from the indirect analysis (using the resonance effects on the forced terms of nutation) we found that the resonance period remained very stable throughout the whole interval, and was equal to 430.55 [+ or -] 0.11 solar days. Similar results were obtained from VLBI analysis also by other authors (Roosbeek et al., 1999 or Hinderer et al., 2000), who concluded that the RFCN period is stable within 3 days, and is close to 430 solar days.
Well-defined periods are observed: those of "stellar" (1,436 minutes) and "solar" (1,440 minutes) days, "calendar" (365 average solar days), "tropical" (365 solar days 5 hours 48 minutes) and "sidereal" (365 days 6 hours 9 minutes) years [1].
"The solar day is gradually getting longer because earth's rotation is slowing down ever so slightly," said Daniel MacMillan, scientist at the Nasa's Goddard Space Flight Center in Greenbelt, in a statement.
"The solar day is gradually getting longer because Earth's rotation is slowing down ever so slightly," said Daniel MacMillan of NASA's Goddard Space Flight Center in Greenbelt, Md.
Galperin's advice, showed that the daily period is distinctly resolved to two peaks: the "sidereal day" (1436 min) and the "solar day" (1440 min).
"This latest study supplements previous work and supports the general hypothesis that the entire 24-hour pattern of light/dark exposure influences synchronization of the body's circadian clock with the solar day and thus influences teenagers' sleep/wake cycles," explained Figueiro.
Time * 65 136 180 230 280 solar days/year 370.9 377.2 381.2 385.9 390.6 length of solar day (hr) 23.6 23.2 23.0 22.7 22.4 Time * 715.0 85.0 900 1200 2000 solar days/year 435.0 450.2 456.0 493.2 615.4 length of solar day (hr) 20.1 19.5 19.2 17.7 14.2 Time * 345 405 500 600 solar days/year 396.8 402.6 412.2 422.6 length of solar day (hr) 22.1 21.7 21.3 20.7 Time * 2500 3000 3560 4500 solar days/year 714.0 835.9 1009.5 1434.0 length of solar day (hr) 12.3 10.5 8.7 6.1 * Time is measured in million years (m.y.) before present.