To knowe the cenyth of the arising of the sonne, this is
to seyn, the partie of the orisonte in which that the sonne
arisith.
Thou must first considere that the sonne arisith not alwey
verrey est, but somtyme by northe the est and somtyme by south
the est. Sothly the sonne arisith nevere moo verrey est in oure
orisonte, but he be in the heved of Aries or Libra. Now is thin
orisonte departed in 24 parties by thin azimutes in
significacioun of 24 parties of the world; al be it so that
shipmen rekene thilke parties in 32. Than is there no more but
wayte in which azimut that thy sonne entrith at his arisyng, and
take there the cenith of the arisyng of the sonne.
The manere of the divisioun of thin Astrelabie is this, I
mene
as in this cas: First it is divided in 4 plages principalis with
the lyne that goth from est to west; and than with another lyne
that goth fro south to north; than is it divided in smale parties
of azymutz, as est, and est by south, where as is the first
azymut above the est lyne; and so furth fro partie to partie til
that thou come ageyn unto the est lyne. Thus maist thou
understonde also the cenyth of eny sterre, in which partie
he riseth.
