AstroRange

is an option of AstroGraphics that specifies the included range of coordinates on the celestial sphere.

Details

AstroRange provides the main way to specify explicit regions of the celestial sphere to include in AstroGraphics maps.
The following settings can be used:

	All	the entire celestial sphere is included
	Automatic	automatically select the region to display
	Full	same as All when used in astro graphics
	{{lon₁,lon₂},{lat₁,lat₂}}	explicit limits for spherical coordinates
	{All,{lat₁,lat₂}}	complete longitude range and specified latitude range
	{{lon₁,lon₂},All}	specified longitude range and complete latitude range
	r	explicit numerical radius, assumed to be in angular degrees
	quantity	explicit radius as a Quantity angle
	entity	use bounding box of the given astro entity

AstroRanger or AstroRangequantity represents a range enclosing a spherical circle of the given radius around the center specified by AstroCenter or by the content of the first argument of AstroGraphics.
AstroRangeAutomatic selects a region adapted to the content of the first argument of AstroGraphics. For a pointlike case, like a star, a spherical disk of 10 angular degrees around that point is used. With no input information, as in AstroGraphics[], the full celestial sphere or a hemisphere of it will be selected, depending on the selected astro reference frame and projection.
AstroRangePadding can be used to extend the bounding box defined by AstroRange.
Options[amap,AstroRange] returns the AstroRange value used in the AstroGraphics map amap.

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Visualize the current sky toward your local north:

Specify a center and an angular radius around it:

Specify all four coordinate limits:

Show a band of the sky around the ecliptic:

Show one hemisphere in equatorial coordinates:

Show an area of 1.5 degrees radius around M31:

Specify the same radius using a number, understood in angular degrees:

Alternatively, use a mixed quantity:

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