04-08-2014, 10:17 AM
Measurement of orientation of a site
For determioning the cardinal points of a site with the help of a gnomon,one should proceed at sunrise during a clear sky. A piece of ground in the moddle of a chosen site should be levelled by the water method.This must be a square of one square pole in the centre of which the gnomon should be set.
One cubit long,its diameter is one digit at the top and five at the bottom, it is perfectly circular and without irregularities.
A circle is drawn of which the gnomon is the centre and of which the diameter is double the length of the gnomon. The line which joins the two points where the shadow of gnomon has touched the circle in the morning and in the evening gives the east west direction.The radius of circle being equal to the height of the gnomon,the shadow touches the circle when the sun is at 45 degrees in the morning and in the afternoon.
For determioning the cardinal points of a site with the help of a gnomon,one should proceed at sunrise during a clear sky. A piece of ground in the moddle of a chosen site should be levelled by the water method.This must be a square of one square pole in the centre of which the gnomon should be set.
One cubit long,its diameter is one digit at the top and five at the bottom, it is perfectly circular and without irregularities.
A circle is drawn of which the gnomon is the centre and of which the diameter is double the length of the gnomon. The line which joins the two points where the shadow of gnomon has touched the circle in the morning and in the evening gives the east west direction.The radius of circle being equal to the height of the gnomon,the shadow touches the circle when the sun is at 45 degrees in the morning and in the afternoon.