The inverse function of the secant; the angle that has a secant equal to a given number.
1
Its disc spans 18 arcsec, with bands of cloud that are a pale imitation of those of Jupiter.
2
Viewed telescopically, it shrinks from 7.5 to 6.5 arcsec wide.
3
Catch them below-left of the Moon on the 15th when the cloud-swathed planet appears 41 arcsec wide.
4
Shrinking in width from 41 to 37 arcsec, it stands near the Moon on the 3rd and 30th.
5
The unrivalled rings, though, stretch for 41 arcsec and are wide open with their N face tipped 27° towards us.