Proceedings of the 2014 International Conference on Physics and its Applications

Implications of Twilight Sky Brightness Measurements on Fajr Prayer and Young Crescent Observation

Authors
Dhani Herdiwijaya
Corresponding Author
Dhani Herdiwijaya
Available Online September 2014.
DOI
https://doi.org/10.2991/icopia-14.2015.5How to use a DOI?
Keywords
twilight, sky brightness, fajr prayer, young crescent moon
Abstract

The morning and evening twilight brightness are important to probe the properties of the upper atmosphere. We conducted a short survey of broad band twilight sky brightness measurements by using a portable photometer with 5 second resolution, in five places with different elevations. The darkest zenith sky brightness reached 22.9 MPASS. We found the complex twilight sky brightness variation and proposed 17 degree solar dip for Fajr prayer. The observable young crescent moon which has less than 24 hours in age has the sky brightness at the range of 8-16 magnitude/arcsec2. These correspond to telescope visual limiting magnitude of 2.9 to 9.3. The excellent quality of telescope is needed for this purpose to cope with very low contrast of young crescent moon.

Copyright
© 2015, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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Volume Title
Proceedings of the 2014 International Conference on Physics and its Applications
Series
Advances in Physics Research
Publication Date
September 2014
ISBN
978-94-62520-51-6
ISSN
2352-541X
DOI
https://doi.org/10.2991/icopia-14.2015.5How to use a DOI?
Copyright
© 2015, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Cite this article

TY  - CONF
AU  - Dhani Herdiwijaya
PY  - 2014/09
DA  - 2014/09
TI  - Implications of Twilight Sky Brightness Measurements on Fajr Prayer and Young Crescent Observation
BT  - Proceedings of the 2014 International Conference on Physics and its Applications
PB  - Atlantis Press
SP  - 26
EP  - 29
SN  - 2352-541X
UR  - https://doi.org/10.2991/icopia-14.2015.5
DO  - https://doi.org/10.2991/icopia-14.2015.5
ID  - Herdiwijaya2014/09
ER  -