5 De eN

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Angles at che Pole, and tlie right Angle at the Zenith, and thereforemay find the Arks ↄf the Vertical, between the Meridian and theHour circles, after this manner.

A ihe Sine f Ho gr.10 te the Coſine of the Latitude:So the Jangent ef the Hour, N10 the Tangent F the Hour-line from the Mixidian.

Extend the Compaſſes from the Sine of 90 gr. to the Sine of theComplement of the Latitude, ſo the ſame extent ſhall reach from theTangent of che Hour, to the Tangent of the Hour- line from the Meridian, N a Thus