Same Moon
Wherever the two of you live, you see the same Moon in the same phase. Each predict tomorrow's, swap codes, and look up tomorrow night. A good one for a grandparent and a grandchild in different cities.
Tonight
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Worked out from today's date, so it can be a day out near the change from one phase to the next. Clouds are the other reason to look.
Predict tomorrow
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For children, the Moon and planets live in StarForge on Spark & Anvil.