Experimental Astronomy

, Volume 18, Issue 1–3, pp 39–64 | Cite as

New Criterion for Lunar Crescent Visibility

  • Mohammad Sh. Odeh


A new criterion for lunar crescent visibility has been established using 737 observations, almost half of them obtained by the Islamic Crescent Observation Project (ICOP). This criterion is based on two variables, viz. the topocentric arc of vision and the topocentric crescent width. The new model is able to predict the visibility of the lunar crescent both for naked eye and optically aided observations. From the database we found a Danjon limit of 6.4 degrees.


Crescent Moon 


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  1. Caldwell, J., Laney, C.: First visibility of the Lunar crescent. SAAO, African Skies 5 (2001)Google Scholar
  2. Danjon, A.: L'Astronomie 50, 2 (1936)Google Scholar
  3. Doggett, L., Schaefer, B.: ICARUS 107, 388 (1994)ADSCrossRefGoogle Scholar
  4. Ilyas, M.: QJRAS 35, 425 (1994)ADSGoogle Scholar
  5. McNally, D.: QJRAS 24, 417 (1983)ADSGoogle Scholar
  6. Schaefer, B.: QJRAS 29, 511 (1988)ADSGoogle Scholar
  7. Schaefer, B.: QJRAS 32, 265 (1991)ADSGoogle Scholar
  8. Schaefer, B.: QJRAS 37, 759 (1996)ADSGoogle Scholar
  9. Yallop, B.: A method for predicting the first sighting of the new Crescent Moon', RGO NAO Technical Note No. 69 (1997)Google Scholar

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Arab Union for Astronomy and Space Sciences (AUASS)AmmanJordan

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