Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun
arcsecant - noun Abbreviation of
arcsecond .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the inverse function of the secant; the angle that has a secant equal to a given number
Etymologies
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Examples
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Through a telescope, its phase changes between 28% and 76% sunlit as its diameter shrinks from 8.5 to 5.9 arcsec.
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Jupiter's disc is 47 arcsec wide when the planet lies alongside the Moon on the night of the 16th.
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During February, it brightens from mag -4.1 to -4.2 and its gibbous disc swells from 15 to 18 arcsec.
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At opposition, Jupiter is 594 million km distant and shows a cloud-banded 50 arcsec disc through almost any telescope.
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Moving westwards below Leo's rear, it brightens from mag -0.6 to -1.2 and improves from 12 to 14 arcsec in diameter.
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Its cloud-banded disc is 37 arcsec wide at mid-month.
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Mars, slow-moving below Leo's hindquarters, doubles in brightness from mag 0.2 to -0.6 as its distance plummets from 156 million to 119 million km and its diameter swells to 12 arcsec.
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Fading from mag -2.6 to -2.4 and shrinking in diameter from 43 to 39 arcsec during the month, it is conspicuous near the Moon on the 2nd and again on the 30th.
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Catch it 6° below-left of the earthlit crescent Moon on the 26th when its gibbous disc is 15 arcsec across.
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Look for the Moon below Saturn and alongside Spica on the 14th when a telescope shows the planet's disc and rings to be 19 and 42 arcsec wide respectively.
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