A plain declaration of the vulgar new heavens flatform serving not onely fore this age, but also fore the future age of 100 years.

About this Item

Title: A plain declaration of the vulgar new heavens flatform serving not onely fore this age, but also fore the future age of 100 years.
Author: Halley, Edmond, 1656-1742.
Publication: [London? :: s.n.,; 1679]
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Subject terms: Astronomy -- Observations -- Early works to 1800.; Sun -- Observations -- Early works to 1800.; Dialing -- Early works to 1800.
Cite this Item: "A plain declaration of the vulgar new heavens flatform serving not onely fore this age, but also fore the future age of 100 years." In the digital collection Early English Books Online. https://name.umdl.umich.edu/A45349.0001.001. University of Michigan Library Digital Collections. Accessed May 3, 2024.

Pages

IV. EXEMPLE.

Desiring to knowe the Suns Declination in the yeare of 1710. whe the Sun is in the 18th. degr. of ♌. Then you must lay the dial A upon the 18 degr. you'l also see that the dial doth then lie on the eleventh day of August, about on the third fourth part of the parck of that day, being in the evening about 6 a clock. Then you must further lay the dial A upon the 42th. degree, from ♎. to Cancer upon the houre circkle, being on the 18th. degree of ♌, then you must place one foot of the Compassis on the dial A upon 23 degr. 32 min. as before, en then you must open the other foot, rectan∣gularly unto the Line of 6 a clock, with this opening you must place one foot of the Compassis in the Centrum of the dial A, and then you must turn the other foot downewards, and see on what degree and minute it falls, you'l find it to be verry neare 15 degr. 30 min. being at the said time the Declination of the Sun.