All computations are done with a temporal resolution of 1 day and a spatial resolution of 0.5?geographical latitude ?0.5?geographical longitude, which is equivalent to 55 km ?55 km at the equator.
12.
The range of geographical latitudes and longitudes of the district is from 19.01'N to 21.03'N and from 75.04'E to 76.04'E, with gently to moderately sloping topography.
13.
In 1670, Gabriel Mouton published a proposal that was in essence similar to Wilkins'proposal, except that his base unit of length would have been 1 / 1000 of a minute of arc ( about 1.852 m ) of geographical latitude.
14.
This is in contrast to the better known saros, which has a period of about days, so successive solar eclipses tend to take place about 120?in longitude apart on the globe ( although at the same node and hence at about the same geographical latitude ).
15.
Where L is the sundial's geographical latitude, H _ V is the angle between a given hour-line and the noon hour-line ( which always points due north ) on the plane, and " t " is the number of hours before or after noon.
16.
Since the gnomon's style must be parallel to the Earth's axis, it always " points " true North and its angle with the horizontal will equal the sundial's geographical latitude; on a direct south dial, its angle with the vertical face of the dial will equal the colatitude, or 90?minus the latitude.
17.
Where ? is the sundial's geographical latitude ( and the angle the style makes with horizontal ), ? is the angle between a given hour-line and the noon hour-line ( which always points towards true North ) on the plane, and " t " is the number of hours before or after noon.
18.
Where L is the sundial's geographical latitude ( and the angle the style makes with horizontal ), H _ H is the angle between a given hour-line and the noon hour-line ( which always points towards true North ) on the plane, and " t " is the number of hours before or after noon.
19.
Where R is the desired angle of reclining relative to the local vertical, L is the sundial's geographical latitude, H _ { RV } is the angle between a given hour-line and the noon hour-line ( which always points due north ) on the plane, and " t " is the number of hours before or after noon.
20.
He points out that while Thales is held to have been able to calculate an eclipse using a cycle called the " Saros " held to have been " borrowed from the Babylonians ", " The Babylonians, however, did not use cycles to predict solar eclipses, but computed them from observations of the latitude of the moon made shortly before the expected syzygy . " Dicks cites historian O . Neugebauer who relates that " No Babylonian theory for predicting solar eclipse existed at 600 B . C ., as one can see from the very unsatisfactory situation 400 years later; nor did the Babylonians ever develop any theory which took the influence of geographical latitude into account . " Dicks examines the cycle referred to as'Saros'- which Thales is held to have used and which is believed to stem from the Babylonians.
