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Explanation of the sun’s movement and the change in the shadow’s direction. This is done also by keeping track of time.

angle in Arras : 32°37’= 32° + 37 x 100/60 = 32,617°
angle in Xewkija : 17°45’= 17° + 45 x 100/60 = 17,750°
difference between the angles : 32,617° - 17,750° = 14,867° distance between the parallels : 1583km
circumference :1583 x 360 / 14,867 = 38332km

Distance between the parallels : Cañada de Gómez-Xewkija 7657km Différence between the angles: 15°40’-(-53°09’)=(15+40/60)+(53+9/60)=15,667+53,150 = 68,817° Circumference of the Earth=7657x360/68,817=40 056 km