What does GC mean in UNIT MEASURES

Galactic Coordinates are a system of measurement used to locate positions within the Milky Way Galaxy. They are similar to latitude and longitude on Earth, except they measure the angle from a point in space rather than a location on the surface of the planet. The Galactic Coordinates system is divided into two components - the galactic longitude and latitude.

To calculate your position in space using galactic coordinates, you must first know your exact location in relation to the galactic center. This can be found by calculating the angular separation of your position from a reference point (typically known as l, b). Once you have this value, you can use the formula l=RA+tan-1(sin(b)*cos(l)), where RA is the right ascension of the reference point and b is its declination.

Right Ascension (RA) and Declination (Dec) are both coordinates that describe a position relative to an equatorial reference frame. RA denotes how far east or west on the celestial sphere an object lies, while Dec gives its north or south latitude relative to this same plane. These coordinates make up part of what is referred to as an "equatorial coordinate system".

Galactic coordinates are used for charting objects such as stars and galaxies within our Milky Way Galaxy, providing a convenient way of describing their locations in space. Astronomers also use them when computing distances between objects, studying star formation regions, and plotting maps of defined areas within our galaxy.

The origin point for galactic coordinates is located at the center of our Milky Way galaxy, which is believed to be located about 26,000 light years away from Earth's solar system. This origination point was chosen by astronomers so that all locations within our galaxy could be identified using a consistent set of measurements relative to this single central point.

While both equatorial and galactic coordinates measure angles relative to points in space, they actually refer to different planes; equatorial coordinates use an earth-centered coordinate system while galactic coordinates measure angles along with lines drawn outwards from the center of our galaxy towards any given direction in space that might contain stars or other objects worthwhile exploring by astronomers.

When measuring angles in galactic coordinates typically degrees are used (degrees are also known as gradians). Degrees represent 1/360th part of an entire circle so 180° represents half a circle and 360° forms one complete cycle around any given point. Additionally minutes and seconds may also be used in order to more accurately identify very small subsections within already existing degrees/gradians/circles.

No, despite changes that occur over time throughout our ever-expanding universe due to its dynamic nature;the origin point remains constant since it has been determined based on fixed points such as stars or distant galaxies whose positions do not change significantly over time relative to one another (thus providing a fixed reference).

Galactic coordinates can also be applied here on Earth—they're particularly useful when mapping out large geographic areas such as cities or national parks—as well as being used for navigation purposes via GPS satellites which rely on precise measurements taken from this system.