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...or = Jaffe, Walter|title = A simple model for the distribution of light in spherical galaxies|journal = Monthly Notices of the Royal Astronomical Society|volume ...derived heuristically from the observation that the brightness profiles of spherical galaxies seem to run as <math>r^{-3}</math> and <math>r^{-1}</math> in at l ...

....as.arizona.edu/~fan/Home/AST541_files/SphericalCollapse.pdf AST541 Notes: Spherical Collapse, Press-Schechter Oct/Nov 2018]</ref> The parameters were empirica [[Category:Equations of astronomy]] ...

...'''Bondi–Hoyle–Lyttleton accretion'''), named after [[Hermann Bondi]], is spherical [[Accretion (astrophysics)|accretion]] onto a [[compact object]] traveling ...=https://ned.ipac.caltech.edu/level5/March09/Edgar/Edgar2.html|journal=New Astronomy Reviews|access-date=19 February 2018|language=en|doi=10.1016/j.newar.2004.0 ...

...</math> on the sphere is written as <math>f(\lambda,\theta)</math> using [[spherical coordinates]], i.e., ...ci. Comp, 16 (1995), pp. 1071–1081</ref> perhaps due to the dominance of [[spherical harmonics]] expansions. Over the last fifteen years it has begun to be used ...

[[File:Positional astronomy.svg|thumb|400px|Diagram of [[positional astronomy]]]] In [[positional astronomy]], two [[astronomical object]]s are said to be in '''opposition''' when the ...

...scription|Radius of a circle or sphere equivalent to a non-circular or non-spherical object}} {{redirect|Mean radius|the usage in astronomy|mean radius (astronomy)}} ...

...t|astronomical body]] such as [[Earth]]. This precession is due to the non-spherical nature of a rotating body, which creates a non-uniform [[gravitational fiel ...ital plane would remain fixed in space around the gravitational [[primary (astronomy)|primary body]]. However, most bodies rotate, which causes an [[equatorial ...

...eonard–Merritt mass estimator''' is a formula for estimating the mass of a spherical [[stellar system]] using the apparent (angular) positions and [[proper moti | journal = [[Astronomy and Astrophysics]] ...

{{Redirect|Mean diameter (astronomy)|other uses|Diameter (disambiguation)}} {{Redirect|Dimensions (astronomy)|other uses|Dimension (disambiguation)}} ...

=== Part 1: Tables for spherical astronomy === ...of small right triangles in minutes and seconds, and tables for spherical astronomy for degrees of the ecliptic of: declination, right ascension, oblique ascen ...

...he parallactic angle is 0° or 180° when the object crosses the [[meridian (astronomy)|meridian]]. ...,<ref>{{cite book|first=Simon|last=Newcomb|title=A compendium of spherical astronomy|year=1906|page=[https://archive.org/details/cu31924004071688/page/n154 133] ...

...athematical function that describes how the density <math>\rho</math> of a spherical stellar system varies with distance <math>r</math> from its center. [[Jaan *[http://adsabs.harvard.edu/abs/2005MNRAS.358.1325C Spherical galaxy models with power-law logarithmic slope]. A comprehensive paper that ...

...y the gravitational forces of the [[Moon]] and [[Sun]] acting upon the non-spherical [[figure of the Earth]]. Precession is the effect of these forces [[average ...r a period of about 18.6 years (this period is referred to as the [[saros (astronomy)|saros]]). Because the Earth's equator is itself inclined at an angle of ab ...

...sphere]]. Applications requiring triangle solutions include [[geodesy]], [[astronomy]], [[construction]], and [[navigation]]. ==Solving spherical triangles== ...

...ew Hipparcos reduction|author=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752 ...parcos stars in a common system|author=Gontcharov, G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10 ...

metric in [[spherical coordinates]] is given by<ref name=revistas/> {{Portal|Astronomy|Physics}} ...

...ly derived by [[James Clerk Maxwell]]. However, they were first applied to astronomy by [[James Jeans]] in 1915 while working on stellar hydrodynamics. Since th ...sor.<ref name=":0">{{Cite web |last=Van Den Bosch |first=Frank |title=Yale Astronomy Lecture Notes |url=http://www.astro.yale.edu/vdbosch/lecture7.pdf}}</ref> ...

...virial theorem. The virial radius is determined using a "top-hat" model. A spherical "top hat" density perturbation destined to become a galaxy begins to expand ...l|last=White|first=M|date=3 February 2001|title=The mass of a halo|journal=Astronomy and Astrophysics|volume=367|issue=1|pages=27–32|arxiv=astro-ph/0011495|bibc ...

...ref>{{cite book |last=Thompson |first=Richard |title=Vedic Cosmography and Astronomy |year=2003 |publisher=Motilal UK Books of India |isbn=978-8120819542 |pages ...

...986 | title = Collective relaxation of stellar systems | url = | journal = Astronomy & Astrophysics | volume = 160 | issue = | page = 203 | bibcode = 1986A&A... ...</ref> Gurzadyan and Savvidy showed the exponential instability (chaos) of spherical N-body systems interacting by Newtonian gravity and derived the collective ...