sidereal day
noun
plural sidereal days
: the interval between two successive transits of a point on the celestial sphere (such as the vernal equinox) over the upper meridian of a place : 23 hours, 56 minutes, 4.1 seconds of mean time
In recent experiments, the frequency … was found to vary by not more than 100 μHz over a sidereal day as the rotation of the earth changed the orientation of the ions (fixed by the laboratory magnetic field) with respect to the external universe.
David Golden
David Golden
Word History
First Known Use
circa 1678, in the meaning defined above
- dwarf larkspur
- dwarf laurel
- dwarf lemur
- dwarf lupine
- dwarf male
- dwarf mallow
- dwarf maple
- dwarf milkweed
- dwarf minke whale
- dwarf mistletoe
- dwarf mountain fir
- dwarf mountain pine
- dwarf mulberry
- dwarf nettle
- dwarf nipplewort
- dwarf oak
- dwarf palmetto
- dwarf partition
- dwarf pea
- dwarf phlox
- dwarf pine
- dwarf planet
- dwarf plantain
- dwarf pocket rat
- dwarf rafter