Editing Morning (section)

===Astronomy===
[[File:Comet ison.jpg|right|thumb|[[Comet Ison]] at dawn, with Mercury at left]]
When a star first appears in the east just prior to sunrise, it is referred to as a [[heliacal rising]].<ref>{{cite journal
 | title=Heliacal Rise Phenomena
 | last=Schaefer | first=Bradley E. | author-link=Bradley Schaefer
 | journal=Journal for the History of Astronomy, Archaeoastronomy Supplement
 | volume=18 | page=S19 | year=1987
 | issue=11 | doi=10.1177/002182868701801103 | bibcode=1987JHAS...18...19S
}}</ref> Despite the less favorable lighting conditions for [[optical astronomy]], dawn and morning can be useful for observing objects [[orbit]]ing close to the Sun. Morning (and evening) serves as the optimum time period for viewing the [[Inferior and superior planets|inferior planets]] [[Venus]] and [[Mercury (planet)|Mercury]].<ref>{{cite book
 | chapter=Recording Mercury and Venus
 | first=Peter | last=Grego | year=2008
 | title=Venus and Mercury, and How to Observe Them
 | pages=177–206 | series=Astronomers’ Observing Guides
 | publisher=Springer | location=New York, NY.
 | doi=10.1007/978-0-387-74286-1_5
| isbn=978-0-387-74285-4 }}</ref> Venus and sometimes Mercury may be referred to as a morning star when they appear in the east prior to sunrise. It is a popular time to hunt for [[comet]]s, as their [[comet tail|tails]] grow more prominent as these objects draw closer to the Sun.<ref>{{cite conference
 | title=Search Programs for Comets
 | last=Marsden | first=B. G.
 | conference=Asteroids, Comets, Meteors 1993: Proceedings of the 160th Symposium of the International Astronomical Union, held in Belgirate, Italy, June 14-18, 1993. International Astronomical Union. Symposium no. 160
 | editor1-first=Andrea | editor1-last=Milani
 | editor2-first=Michel | editor2-last=Di Martino
 | editor3-first=A. | editor3-last=Cellino
 | location=Dordrecht | publisher=Kluwer Academic Publishers
 | page=1 | year=1994 | bibcode=1994IAUS..160....1M
}}</ref> The morning (and evening) twilight is used to search for [[near-Earth asteroid]]s that orbit inside the orbit of the Earth.<ref>{{cite journal
 | title=A Twilight Search for Atiras, Vatiras, and Co-orbital Asteroids: Preliminary Results
 | last1=Ye | first1=Quanzhi | last2=Masci | first2=Frank J.
 | last3=Ip | first3=Wing-Huen | last4=Prince | first4=Thomas A.
 | last5=Helou | first5=George | last6=Farnocchia | first6=Davide
 | last7=Bellm | first7=Eric | last8=Dekany | first8=Richard
 | last9=Graham | first9=Matthew J. | last10=Kulkarni | first10=Shrinivas R.
 | last11=Kupfer | first11=Thomas | last12=Mahabal | first12=Ashish
 | last13=Ngeow | first13=Chow-Choong | last14=Reiley | first14=Daniel J.
 | last15=Soumagnac | first15=Maayane T. | display-authors=1 
 | journal=The Astronomical Journal
 | volume=159 | issue=2 | id=70
 | date=February 2020 | page=70 | doi=10.3847/1538-3881/ab629c
 | arxiv=1912.06109 | bibcode=2020AJ....159...70Y
| doi-access=free }}</ref> In [[mid-latitudes]], the mornings near the [[Autumnal equinox (disambiguation)|autumnal equinox]] are a favorable time period for viewing the [[zodiacal light]].<ref>{{cite web
 | title=Zodiacal Light: The Definitive Photography Guide
 | first=Antoni | last=Cladera
 | website=photopills.com
 | url=https://www.photopills.com/articles/zodiacal-light-photography-guide
 | access-date=2023-03-14 }}</ref>