It can be contrasted with there, which is somewhere else; and with anywhere, which theoretically includes both here and all possible theres; and with nowhere, which excludes both here and there.
Hither is the direction that leads to here. When you tell someone to come hither you are asking them to come in your direction. When you tell someone to come here you are asking them to come to your location. There is a difference. Similarly, hence means "from here". "Hence" also means "therefore", in which sense it expresses a figurative rather than literal meaning of "from here".
Omnipresence is one of the traditional attributes of God in monotheistic theology. It means that wherever you are, God is here.
Baba Ram Dass, the Hindu writer, wrote a 1971 book in which he advised his readers to Be Here Now.
If you are human, it is extremely likely that you are within the Virgo Supercluster, inside the Local Group and in that more specifically in a spiral arm of the Milky Way galaxy in the solar system of the Sun. You may be in orbit around earth, but more likely you are somewhere on or below the surface of it or submerged or in flight or are suspended above it by a human construction or natural entity or phenomenon.