82v
3.
A Theoreme.
The difference of longitude, of the extremes of any segment of the
Rombe of 45g: is the nomber of æquall degrees æquinoctiall or meridian
that is æquall to the difference of latitude to the unæquall degrees
of the difference of latitude of the sayd extremes. Be it that the
extremes be both out of the æquinoctiall or out in the same: or
both being out on one side of the æquinoctiall only, or one on
the one side & the other on the other.
Rombe of 45g: is the nomber of æquall degrees æquinoctiall or meridian
that is æquall to the difference of latitude to the unæquall degrees
of the difference of latitude of the sayd extremes. Be it that the
extremes be both out of the æquinoctiall or out in the same: or
both being out on one side of the æquinoctiall only, or one on
the one side & the other on the other.
1. Consectary
Hereby it followeth that of the same segment rising from
the æquinoctiall: the difference of longitude of the other end
is the nomber of æquall degrees (found by my canon nautical)
that are answerable to the difference of latitude in
unæquall degrees.
the æquinoctiall: the difference of longitude of the other end
is the nomber of æquall degrees (found by my canon nautical)
that are answerable to the difference of latitude in
unæquall degrees.
2. Consectary