Canopus
−52°42′
Measured
Declination of Canopus, rounded
PhotoESO/J. GirardCC BY 4.0
J2000 declination of Canopus is about −52°41′44″. Minus fifty-two degrees forty-two minutes is the rounded helm.
What it supports
A measured equatorial coordinate. The Book’s helmsman plate keeps the rounding visible.
What it does not
Not exact 42′. Not a 42° altitude.
ExactnessApproximate
Form42′
Unit° ′
Strengthhard