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International Astronomical Center

World Record Crescent Observations


Last Updated 09 November 2019

In This Page:-


Naked Eye Observations

Below are the details of the world record crescent observations, which were seen by naked eye, we will list three records, which are: youngest age, minimum lag time and smallest elongation from Sun.

Youngest Age:-


Minimum Lag Time:-


Smallest Elongation from Sun:-


Optical Aid Observations

Below are the details of the world record crescent observations, which were seen using optical aid, we will list four records, which are: youngest topocentric age, youngest geocentric age, minimum lag time and smallest elongation from Sun.

Youngest Topocentric Age:-


Youngest Geocentric Age:-


Minimum Lag Time:-


Smallest Elongation from Sun:-


Daylight Observations

Below are the details of young crescents which were observed at daylight time using optical aid, and the observer was not able to see the crescent after sunset despite having clear sky after sunset.

Shawwal 1428 AH:-


Ordinary Imaging

Below are the details and photos of the world record crescent observations captured by ordinary camera, we will list three records, which are: youngest age, minimum lag time and smallest elongation from Sun.

Youngest Age:-




Minimum Lag Time:-


Smallest Elongation from Sun:-


CCD Imaging

Below are the details and photos of crescents captured by a CCD camera with filters using special telescope, and then the observer made some image processing to enhance the results. All these pictures were taken during broad daylight!

Youngest Geocentric Age:-


Kindly Click on the Image to Enlarge


Youngest Topocentric Age:-


Smallest Elongation from Sun:-


World Record in Muslim World (Rabee Awwal 1441 AH):-


Kindly Click on the Image to Enlarge. This GIF shows the crescent with a minor movement during the observation.




Kindly Click on the Image to Enlarge. Clearer photo for the crescent minutes before sunset.


Definitions

  • Topocentric Age: Time elapsed from the topocentric conjunction up to the time of interest.
  • Geocentric Age: Time elapsed from the geocentric conjunction up to the time of interest.
  • Lag time: Time difference between sunset and moonset, or from moonrise and sunrise for waning crescent
  • Elongation: Topocentric angular separation between the centers of Sun and Moon. It is called Arc of Light as well (ARCL).
  • Relative Azimuth: Topocentric azimuth difference between Sun and Moon. It is called Delta Azimuth as well (DAZ).
  • Relative Altitude:Topocentric altitude difference between Sun and Moon. It is called Arc of Vision as well (ARCV).
  • Moon Altitude: Topocentric Moon airless altitude not corrected for refraction.
  • Sun Altitude: Topocentric Sun airless altitude not corrected for refraction.

    Note from ICOP Memeber Mr. Qamar Uddin: "Please could you also make a special mention of the fact that those "World Records Crescent Observations" are carried out by astronomy experts, who have a lot of experience of knowing when and where to look (possibly with optical aids to find the moon)! So, that ordinary Muslims may not "blame" themselves for not seeing the crescent at the same time/location."


    By Mohammad Odeh. Copyright © 1998-2019. IAC, All Rights Reserved. This material may not be reproduced in any form without permission. For more information Kindly send E-mail

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