Editing Heliacal rising (section)

==Acronycal and cosmic(al)==
The rising of a planet above the eastern horizon at [[sunset]] is called its ''[[Wiktionary:acronycal|acronycal]] rising'', which for a [[superior planet]] signifies an [[opposition (planets)|opposition]], another type of [[syzygy (astronomy)|syzygy]]. When the Moon has an acronycal rising, it will occur near [[full moon]] and thus, two or three times a year, a noticeable [[lunar eclipse]].

''[[Wiktionary:cosmical|Cosmic(al)]]'' can refer to rising with sunrise or setting at sunset, or the first setting at morning twilight.<ref>{{Cite journal|url=https://ui.adsabs.harvard.edu/abs/2012AAS...21915001H|title=Acronical Risings and Settings|first=Thomas A.|last=Hockey|journal=American Astronomical Society Meeting Abstracts #219 |date=January 1, 2012|volume=219|pages=150.01|bibcode=2012AAS...21915001H |via=NASA ADS}}</ref>

Risings and settings are furthermore differentiated between ''apparent'' (the above discussed) and actual or ''true'' risings or settings.

===Overview===
The use of the terms cosmical and acronycal is not consistent.<ref name="Robinson"/><ref name="ESPaCE"/> The following table gives an overview of the different application of the terms to the rising and setting instances.

{| class="wikitable" 
|-
! Daytime
! Visibility
! Rising (east)
! Setting (west)
|-
| rowspan="2" |Morning (matutinal)
| True (in daylight)
| Cosmical
| Acronycal<ref name="ESPaCE"/>/Cosmical<ref name="Robinson"/>
|-
| Apparent (in twilight)
| '''Heliacal <br>(first [[night sky]] appearance)'''
| Heliacal<ref name="ESPaCE"/>/Cosmical<ref name="Robinson"/> <br>(last morning appearance)
|-
| rowspan="2" |Evening (vesper)
| True (in daylight)
| Acronycal
| Cosmical<ref name="ESPaCE"/>/Acronycal<ref name="Robinson"/>
|-
| Apparent (in twilight)
| Heliacal<ref name="ESPaCE"/>/Acronycal<ref name="Robinson"/> <br>(first evening appearance)
| Heliacal <br>(last night sky appearance)
|-
| colspan="4" |<ref name="Robinson">{{cite journal | last=Robinson | first=Matthew | title=Ardua et Astra: On the Calculation of the Dates of the Rising and Setting of Stars | journal=Classical Philology | publisher=University of Chicago Press | volume=104 | issue=3 | year=2009 | issn=0009-837X | doi=10.1086/650145 | pages=354–375| s2cid=161711710 | url=https://discovery.ucl.ac.uk/id/eprint/4840/ }}</ref><ref name="ESPaCE">{{cite web | title=Understanding - Rising and setting of stars | website=Encyclopedia FP7 ESPaCE | url=https://promenade.imcce.fr/en/pages6/725.html | access-date=2022-10-29}}</ref>
|}