Day: Difference between revisions
From Glossary of Meteorology
imported>Perlwikibot (Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == day == </div> #<div class="definition"><div class="short_definition">A basic time increment...") |
imported>Perlwikibot No edit summary |
||
| Line 9: | Line 9: | ||
</div> | </div> | ||
#<div class="definition"><div class="short_definition">A basic time increment defined by the earth's motion; specifically, a complete revolution of the earth about its own axis.</div><br/> <div class="paragraph">The sidereal day is defined as the time required for the earth to make one complete revolution in an [[absolute coordinate system]], that is, with respect to the stars. The day in common use is the [[mean solar day]], derived, by means of the [[equation of time]], from the [[apparent solar day]], which is determined directly from the apparent relative motion of the sun and earth. The [[civil day]] is a modification of the mean solar day, which renders it practical as a time measure for ordinary purposes. <br/>''See also'' [[year]], [[lunar day]].</div><br/> </div> | #<div class="definition"><div class="short_definition">A basic time increment defined by the earth's motion; specifically, a complete revolution of the earth about its own axis.</div><br/> <div class="paragraph">The sidereal day is defined as the time required for the earth to make one complete revolution in an [[absolute coordinate system]], that is, with respect to the stars. The day in common use is the [[mean solar day]], derived, by means of the [[equation of time]], from the [[apparent solar day]], which is determined directly from the apparent relative motion of the sun and earth. The [[civil day|civil day]] is a modification of the mean solar day, which renders it practical as a time measure for ordinary purposes. <br/>''See also'' [[year]], [[lunar day]].</div><br/> </div> | ||
#<div class="definition"><div class="short_definition">The period from midnight to midnight, local [[civil time]]; that is, a [[civil day]].</div><br/> </div> | #<div class="definition"><div class="short_definition">The period from midnight to midnight, local [[civil time]]; that is, a [[civil day]].</div><br/> </div> | ||
#<div class="definition"><div class="short_definition">The period of daylight, as opposed to that of darkness.</div><br/> </div> | #<div class="definition"><div class="short_definition">The period of daylight, as opposed to that of darkness.</div><br/> </div> | ||
Latest revision as of 15:45, 25 April 2012
day
- A basic time increment defined by the earth's motion; specifically, a complete revolution of the earth about its own axis.
The sidereal day is defined as the time required for the earth to make one complete revolution in an absolute coordinate system, that is, with respect to the stars. The day in common use is the mean solar day, derived, by means of the equation of time, from the apparent solar day, which is determined directly from the apparent relative motion of the sun and earth. The civil day is a modification of the mean solar day, which renders it practical as a time measure for ordinary purposes.
See also year, lunar day.
- The period from midnight to midnight, local civil time; that is, a civil day.
- The period of daylight, as opposed to that of darkness.
See pendulum day.
See observational day.
