Sentence examples for arcsec from inspiring English sources
"arcsec" is a correct and usable word in written English
It is a unit of angular measurement equal to one/3600th of a degree, and is typically used when discussing astronomy and astrophysics. For example, "The angular separation of the two stars is 14.3 arcsec."
noun
Abbreviation of arcsecond
Saturn, stationary this month in Ophiuchus, is mag 0.5 and 17 arcsec wide, while its rings are 38 arcsec across and have their N face tipped an impressive 26° towards us.
Jupiter shines at mag –2.5 from a distance of 664m km at opposition, its cloud-banded disc appearing 44 arcsec wide if viewed telescopically.
Telescopically, the 63% sunlit 19 arcsec disc of Venus on the 1st evolves to a 49%and2525 arcsec crescent by the 31st.
Jupiter is 35 arcsec wide when they meet.
Its cloud-belted disc, 42 arcsec wide at mid-month, could hardly be better placed for telescopic study in the evening.
Jupiter's disc, 139,800km across, is 37 arcsec wide at present and swells to 45 arcsec at opposition.
A telescope shows its 19 arcsec disc set within rings that span 43 arcsec and have their N faced tipped 14° towards us.
The star Algieba above Regulus in the Sickle has a fourth magnitude companion less than a Moon's breadth below, while telescopes split the main star into a glorious binary of golden giant stars only 4.6 arcsec apart that take more than 500 years to orbit each other.
In a telescope, Jupiter is about 33 arcsec wide while Venus swells from 22 to 32 arcsec as its distance drops from 113 million to 77 million km.
Mars is a tiny 4 arcsec wide on that morning while Venus is gibbous, 21 arcsec across and 57% sunlit.
Catch it below the Moon on 14 July, when its disc appears 15 arcsec wide if viewed telescopically.
