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Ravnodnevica

S Wikipedije, slobodne enciklopedije
(Preusmjereno sa Ravnodnevnica)
UV vrijeme i datum
ravnodnevice i solsticija na Zemlji[1][2]
Događaj Ravnodnevica Solsticij Ravnodnevica Solsticij
Mjesec Mart[3] Juni[4] Septembar[5] Decembar[6]
Godina
DanVrijemeDanVrijemeDanVrijemeDanVrijeme
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Osvijetljenost Zemlje od Sunca za vrijeme ravnodnevica u martu

Ravnodnevica (ekvinocij) jest tačka na nebeskoj sferi gdje ekliptika presijeca nebeski ekvator. Budući da ga presijeca u dvije tačke, postoje dvije ravnodnevice: proljetna (21. marta) i jesenja (23. septembra).

Na ta dva dana Sunce Zemljanima izlazi tačno na istoku, a zalazi na zapadu. U oba slučaja dan i noć traju po 12 sati. Sunčeve zrake pod pravim uglom obasjavaju Zemljin ekvator.[7]

Također pogledajte

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Reference

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  1. United States Naval Observatory (4. 1. 2018). "Earth's Seasons and Apsides: Equinoxes, Solstices, Perihelion, and Aphelion". Pristupljeno 18. 9. 2018.
  2. Astro Pixels (20. 2. 2018). "Solstices and Equinoxes: 2001 to 2100". Pristupljeno 21. 12. 2018.
  3. Équinoxe de printemps entre 1583 et 2999
  4. Solstice d’été de 1583 à 2999
  5. Équinoxe d’automne de 1583 à 2999
  6. Solstice d’hiver
  7. Der Brockhaus ASTRONOMIE, Brockhaus GmbH, LeipzigMannheim, 2006; ISBN 3-7653-1231-2 (de)

Vanjski linkovi

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