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“second”
(the laser that can produce quadrillions of pulses of light per second, creating a spot on a cell that is as hot as the sun)
(the second newsletter of a series that was formerly presented to subscribers by the Sr. Scribe, a.k.a. John Robertson)
(using definitions and a letter added to the beginning of the second word of two words with the same spellings will produce two completely different words)
Word Entries containing the term:
“second”
arc minute, arc second
Units for measuring small angles, used in astronomy.
An arc minute (symbol ') is one-sixtieth of a degree, and an arc second (symbol ") is one-sixtieth of an arc minute. Small distances in the sky, as between two close stars or the apparent width of a planet's disk, are expressed in minutes and seconds of arc.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 3)