Table for constructing the Robinson Projection
Latitude N/S	Length of parallel	Distance of parallel from equator
0	1.0000	0.0000
5	0.9986	0.0314
10	0.9954	0.0629
15	0.9900	0.0943
20	0.9822	0.1258
25	0.9730	0.1572
30	0.9600	0.1887
35	0.9427	0.2201
40	0.9216	0.2515
45	0.8962	0.2826
50	0.8679	0.3132
55	0.8350	0.3433
60	0.7986	0.3726
65	0.7597	0.4008
70	0.7186	0.4278
75	0.6732	0.4532
80	0.6213	0.4765
85	0.5722	0.4951
90	0.5322	0.5072
Intermediate values can be found by simple interpolation.