How is the Sun's exact constellation boundary crossing determined using coordinates?
Answer
By finding the Sun's ecliptic longitude and checking which constellation boundary that degree value falls within.
To precisely pinpoint the Sun's current constellation location, astronomers rely on specific celestial coordinates. The essential step involves determining the Sun’s current ecliptic longitude. The ecliptic longitude is a measure along the path the Sun appears to trace across the sky. Once this specific degree value along the ecliptic is known, it is cross-referenced against the established modern boundaries of the thirteen astronomical constellations. The exact boundary line where that longitude degree falls dictates which constellation the Sun is currently situated within at that specific moment.
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