Narrower strips are better: sec 8° = 1.01, so a strip of width 16° (centred on the equator) is accurate to within 1% or 1 part in 100.
Băndar tan iknănen uhiz iknan tufit : sec 8°= 1.01, daɣ awen băndar harikăn 16° (eha ammas n equator) oɣad har 1% meɣ ašrut 1 daɣ 100.