circumpolar region | has coordinates whose equatorial latitude is greater than the Earth latitude of the observer minus 90 degrees | ![2001-09-27 09:33:34.0 2001-09-27 09:33:34.0](facet.gif) |
is a part of celestial sphere | ![2001-09-27 09:33:34.0 2001-09-27 09:33:34.0](facet.gif) |
has purpose to define a part of the sky which can be observed all year at the observers location | ![2001-09-27 09:33:34.0 2001-09-27 09:33:34.0](facet.gif) |
has definition a region defined by an equatorial latitude above which stars are visible all year (depends on observers location on Earth) | ![2001-09-27 09:33:34.0 2001-09-27 09:33:34.0](facet.gif) |
is an instance of equatorial sky area | ![2001-09-27 09:33:34.0 2001-09-27 09:33:34.0](facet.gif) |
equatorial sky area | is defined using equatorial coordinates | ![2001-09-27 09:33:34.0 2001-09-27 09:33:34.0](facet.gif) |
quantity | has unit | ![2001-09-27 09:33:12.0 2001-09-27 09:33:12.0](facet.gif) |
number | has value | ![2001-09-27 09:32:57.0 2001-09-27 09:32:57.0](facet.gif) |