答案:
1. partial
2. its timing on the calendar
3. novice observers
4. Sunglasses can only filter harmful rays during total solar eclipses at their greatest magnitude.
5. how to record an eclipse for your posterity
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答案:
1. partial
2. its timing on the calendar
3. novice observers
4. Sunglasses can only filter harmful rays during total solar eclipses at their greatest magnitude.
5. how to record an eclipse for your posterity