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Think about Earth’s orbit
As our planet travels around the Sun, the night side points toward different backgrounds of stars during the year.
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Account for the hour
The sky appears to rotate during the night. A chart prepared for one time may not match an observation many hours later.
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Compare sketches
Draw the brightest stars above a chosen building or tree line. Months later, use the same landmark to notice how the sky has changed.
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Check the season
The night side of Earth faces different directions over the year. A spring chart will not match a winter evening.