These extremes of temperature are particularly striking during a solar eclipse, when the earth passes directly between the sun and the moon, temporarily blotting out the sun’s light.
In this paragraph I am so doubtful whether we can use 'when' for appositive structure. In the above sentence I suppose 'when' is used with two commas for noun group 'solar eclipse' as apposition.
There is no apposition in your example. Appositive modifiers are noun phrases, not clauses. The when clause is a supplementary (non-restrictive) relative clause whose semantic anchor is the preposition phrase “during a solar eclipse”.
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There is no apposition in your example. Appositive modifiers are noun phrases, not clauses.
The when clause is a supplementary (non-restrictive) relative clause whose semantic anchor is the preposition phrase “during a solar eclipse”.