You know what it looks like… but what is it called?
TAKE THE QUIZ“ecliptic limit”
The following 2 entries include the term ecliptic limit.
lunar ecliptic limit
noun: a distance along the ecliptic averaging about 11 degrees on each side of either of the moon's nodes within which the sun must be at full moon in order for a lunar eclipse to occur
solar ecliptic limit
noun: the angular distance from the nodes of the moon's orbit within which an eclipse of the sun may or must occur when the sun and moon are in conjunction there
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Merriam-Webster unabridged