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# Title: Nicolai Mercatoris Holsati, è Soc. Reg. Institutionum Astronomicarum Libri Duo, De Motu Astrorum Communi & Proprio, Secundum Hypotheses Veterum & Recentiorum præcipuas; Deqve Hypotheseon ex observatis constructione (shelfmark Leibn. Marg. 63)
# Folio 17, page id 820424455:0039
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Cap. F.
ASTRONOMTA.
Expolitis hoc modo quatuor circulis principalibus argué
eorum adjunctis, rectat ut percenseamus, qui ex concurtu
ee diritionibus eorum emersune, angulos e arcus. EF
rectos quidem angulos eficere primarium quemque cum
suis secundariis; jam anre memoracum est. Obliqui isitur
Tune, quos quisque efficir cum cateris non transeunribus
per polos luos; possunrque enumerari ordine liC: 1. A-
quatoris ex Felipricae; 2. AEquatoris ec Hlorizontis; (A-
quaroris ee Meridiani rectus est, quod alter per alterius
Dolostranear;) 3. Feliprica _ HOrizontis; 4. Eclipricx
ee Merisiani; (Hlorizonris _ Meridiani rectus est;
5. Meridiani se secundarii Aguatoris, sive circuli decli-
nationis; 6. Meridiani ec secundarii Horizontis, live ver-
ticalis circuli.
Florum primus, quem AEquaror ex Fcliprica in principio
Arieris e Librae Faciuin, semper est praduum vigincierium
cum sermisse, quianens videlicet est arcus Coluri Solsticiorum
ex ipsa sectione verna vel aurumnali eanquam polo descriprus,
ex incer principium Cancri ee nonagelimum sLquatoris ora-
dum comprehentus. Hic isitur arcus metirur obliquicatem
Eclipricae, ex declinarionem Solis ab Aiguatore maximam.
Similiter angulum, quem AEquacor efticir cum Horizonte,
mecitur arcus Meridioni ex ipso cardine Oriencis vel Occi
denris canquam polo descripius, de inter Horizonrem d 
quatorem comprehentus. Hic arcus est nobis Londini com-
morantibus oraduum 38, min. 28. Frejus complementum
ab Aquatore nimirum ad verricem noctrum, est. L atitudo
noctri loci si grad. 32 min. cui semper aequalis cA F leratio
poli, numeranda icidem in Meridiano à cardine Seprencrionis
ad polum arcticum. AEqualiras aurem illa sic demonAratur: