Calcutate the coordinates

Draw the Analemma

Draw the ellipse

Drawing the ellipse in Allahabad

Data
Latitude : 25.45
Longitude : -81.85
Zone meridian : -82.50
Gnomon Height : 2m
E/W-SemiAxis : 2m
OA = 2.00 m ( E/W-SemiAxis )
OB = 0.86 m ( N/S-SemiAxis )
Focus c = OF = 1,81 m
String Length 2a+2c = 7,61 m