they fly on cloudless nights, using the stars. Ingrid

If they have been flying (daylight hours) into twilight, they have dark
adapted as the lighting change has been gradual... they are using a sense of
direction that does not need light so while in the air they can safely
travel and not be lost..... the higher up you are the more of the last rays
of sun you get so it is lighter for them than it appears to us.....


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