What does the the term equator actually describe? Stays the time of day and night dawn to dusk as it does dusk to dawn. where as the polar caps as midnight sun and 30 days of night once a year and winter summer are going on at the same rotations north and south and south and north.
Day and night are separated by dawn and dusk being vertical longitudes where seasonal shifts are latitude temperate zones horizontally between equator and both polar axis points.
Series parallel conditions evolving never leaves results duplicated twice. Why life evolves by the numbers occupying time daily here in 31 parallels of ancestors living in 5 ancestral lineages with 5 generation gaps in plain sight as eternally separated with beating hearts so far.
Self evident changes each body lives through daily here.