Sun divides orbit of earth into four parts. 1) Orbit of East North: summer, Kermpt, Bega and winter are simultaneously recurring in zone 2, 3, 4 and 5. 2) Orbit of West North: autumn, Metsew, Tseday and spring are simultaneously recurring in zone 2, 3, 4 and 5. 3) Orbit of West south: winter, Bega,Kermpt, and summer are simultaneously recurring in zone 2, 3, 4 and 5. 4) Orbit of East South: spring, Tseday, Metsew and autumn are simultaneously recurring in zone 2, 3, 4 and 5.