Want this question answered?
An equinoctial is the great circle between the celestial poles, also known as the celestial equator.
The horizon is the great circle on the sky midway between the celestial poles.
It's the celestial equator.
Orion, which is located on celestial equator.
August means great
Meridian is a geological term. It can be used to describe a line of longitude or a celestial great circle.
Probably the Great Wall, a humongous collection of groups of galaxies.
Because it is the nearest celestial body to our planet Earth. It has great impact on us.
A circle through the Earth's sphere perpendicular to the observer's latitude
August means great
I can not find any reference to a Meridian in the Solar System. In astronomy, there is the Earth's meridian. That's a "great circle" on the "celestial sphere". It passes through the "celestial poles" and also through the "zenith" at the observer's location.
Hercules is a constellation in the sky.A constellation is formally defined as a region of the celestial sphere as seen from Earth.The region of sky designated to be Hercules contains a great many celestial objects which are a whole range of distances from Earth/The Sun.Thus as your question is asking about an area of the visible sky, it has no scientific meaning and no answer is possible.However, if you had asked about a specific object seen in that area of sky - eg Messier 13 (M13), sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, then we can give an answer, M13 is 6.8 kpc away from us.