Hoc peracto, applica Regulam Schithericam puncto horae duodecimae supra punctum E commune intersectionis Meridianae et Aequinoctialis: et sic juxta Regulae longitudinem supra Aequinoctialem applicatae imprime puncta horarum in ipsa Aequinoctiali, adscriptis singulis horis ante et post Meridiem numeris.
Hoc peracto, centurum horologii, uti et styli locum et longitudinem, hac arte inquires. Accipe in Altitudinum Scala altitudinem poli tuae Regionis, veluti Viennae 48 graduum, in parte Regulae, cui scribuntur haec verba: (Elevatio poli pro Horizontalibus) ex A in 48; et hos transfer ex lineae Meridianae puncto E versus A, et in linea imprime punctum V, quod erit centrum horologii.
Locum styli recti, ejusque longitudinem ita repreries. Divide lineam E V bifariam in R, et centro R, intervallo E R
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