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The 29th parallel north is a circle of latitude that is 29 degrees north of the Earth's equatorial plane. It crosses Africa , Asia , the Pacific Ocean , North America , and the Atlantic Ocean . At this latitude the sun is visible for 14 hours, 0 minutes during the summer solstice and 10 hours, 18 minutes during the winter solstice . [ 1 ]
Additionally, one degree of latitude spans around 111 km (the length of a WGS 84 meridian, 20003.93 km / 180°), thus the value of 29.9792458° implies a precision of 0.0111 m or 1.11 cm. It is doubtful that the last 4 digits of the latitude are significant when specifying the location of a building the size of the pyramid.
Coordinates were measured in grades on official French terrestrial ordnance charts from the French revolution well into the 20th century. 1 grade (or in modern symbology, 1 gon) = 0.9° or 0.01 right angle. One advantage of this measure is that the distance between latitude lines 0.01 gon apart at the equator is almost exactly 1 kilometre.
Wavenumber, as used in spectroscopy and most chemistry fields, is defined as the number of wavelengths per unit distance, typically centimeters (cm −1): ~ =, where λ is the wavelength.
The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).