Imagine there was no tilt to the earth's axis and earth's orbit was circular. what would be true about the length of days and nights on earth? a) the periods of day and night would be fixed all year, for any location. b) night, as we know it on earth, would end. we would be in constant daylight. c) the periods of day and night would be fixed all year for anyone living at earth's equator. d) the areas closest to the equator would have constant daylight during the year; the areas near the poles, constant night.