Crossword puzzle clue "semiannual occurrence"

Here are the possible solutions for semiannual occurrence clue

Answer
Clue
Relevancy
solstice
Clue
Semiannual occurrence
ace
Clue
Rare occurrence at the U.S. Open on Father's Day that's a common occurrence at the U.S. Open on Labor Day
Definition
an expert
dst
Clue
Reason for a semiannual shift: Abbr.
equinox
Clue
Semiannual event
Semiannual astronomical event
Semiannual calendar event
Definition
(Latin) the time when the sun crosses the equator
hour
Clue
Semiannual time-change amount
Definition
a period of sixty minutes, also HOWRE
migration
Clue
Birds' semiannual flight
Definition
a removal from one country or climate to another, esp. in a large number

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