the sky??
day break and night fall
Night falls but doesn't break, and day breaks but doesn't fall.
Part of September, October and November, part of December
It is--->chute.
Ukemi is the English spelling of the Japanese word meaning break-fall, typically referring to a controlled fall forward.
I'm tempted to say Day and Night. Daybreak and Nightfall would make sense, but your questions seems to be asking for one thing, not two.
Night falls, as in the expression meaning "night is approaching", but it doesn't break, as "night" is an abstract noun. And day breaks, as in the expression "daybreak", meaning the time of day during which the sun first appears. However, "day", as well, is an abstract noun and cannot literally fall.
Night Fall has 496 pages.
When they say night begins to fall actually means darkness appears therefore night fall.
The Fall of Night was created on 1995-11-01.
Against the Fall of Night was created in 1953.
Where Did the Night Fall was created on 2010-05-10.
Beyond the Fall of Night has 298 pages.
The ISBN of Night Fall is 0-446-57663-8.
Against the Fall of Night has 223 pages.
When the sun rises to begin the new day, night fall ceases.
Beyond the Fall of Night was created on 1990-07-17.