Είναι μονάδα μέτρησης απόστασης. Ορισμός: η απόσταση που θα ταξιδέψει ένα φωτόνιο, κινούμενο στο κενό, μακριά από μάζες και ηλεκτρομαγνητικά πεδία, σε ένα Ιουλιανό έτος (365 μέρες).
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Είναι μονάδα μέτρησης απόστασης. Ορισμός: η απόσταση που θα ταξιδέψει ένα φωτόνιο, κινούμενο στο κενό, μακριά από μάζες και ηλεκτρομαγνητικά πεδία, σε ένα Ιουλιανό έτος (365 μέρες).
Στο μετρικό σύστημα είναι κάτι λιγότερο από δέκα τρισεκατομμύρια χιλιόμετρα ή 63.241 φορές τη (μέση) απόσταση Γης-Ηλίου. Ο ορισμός παραπάνω.