To knowe the altitude of the sonne in myddes of
the day that is clepid the altitude meridian.
Set the degre of the sonne upon the lyne meridional, and rekne
how many degres of almykanteras ben bitwyxe thin est orisonte and
the degre of thy sonne; and tak there thin altitude meridian,
this to seyn, the highest of the sonne as for that day. So maist
thou knowe in the same lyne the heighest cours that eny sterre
fix clymbeth by night. This is to seyn that whan eny sterre fix
is passid the lyne meridional, than begynneth it to descende; and
so doth the sonne.
