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The interval between two passages of the Sun across the meridian is a solar day.
The anomalistic year (365 days 6 hours 13 minutes 53 seconds) is the time between two passages of Earth through perihelion, the point in its orbit nearest the Sun.
If the stars are used, then the interval is called the sidereal day and is defined by the period between two passages of a star (more precisely of the vernal equinox, a reference point on the celestial sphere) across the meridian: it is 23 hours 56 minutes 4.10 seconds of mean solar time.
Similar(57)
The mean delays between two passages were of 5 months.
Much less variations in the number of deregulated genes, not exceeding 2-fold, were observed between the three passages of HepaRG cells.
Cells between three and four passages were used for the experiments.
The cells were passaged before reaching confluence and used at between five and six passages.
The apparent solar day is measured by the interval of time between two successive passages of the Sun across the observer's celestial meridian, the visible half of the great circle that passes through the zenith and the celestial poles.
One sidereal day (very nearly) is measured by the interval of time between two similar passages of a star.
The sidereal day is the time required for the Earth to rotate once relative to the background of the stars i.e., the time between two observed passages of a star over the same meridian of longitude.
Three passages of these strains were conducted.
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