That is also called the axis; the "end-points" of this axis are called the celestial poles.
The components of the celestial sphere include the celestial equator (dividing the sky into northern and southern hemispheres), the north and south celestial poles (points around which the sky appears to rotate), and celestial coordinates (such as right ascension and declination) used to locate objects in the sky. Additionally, the ecliptic (the apparent path of the Sun) intersects the celestial equator at two points known as the vernal and autumnal equinoxes.
june 21 december 21
You measure the angles from east from the first point of Aries (which is the place in the sky where the Sun crosses the celestial equator at the March equinox) and north from the ecliptic (declination).
These are imaginary locations in the sky. The "celestial sphere" is a blanket term for everything beyond the Earth. The celestial equator is the plane of the Earth's equator extended out into space. The "celestial poles" are extensions of the north pole and south pole into space. It's sometimes convenient to describe objects out in space with reference to terrestrial coordinates.
The ends of the earth's axis are imaginary points known as celestial poles. There are north and south celestial poles of the earth.
That is also called the axis; the "end-points" of this axis are called the celestial poles.
The north and south celestial poles are two imaginary points and therefore cannot be "discovered".
The components of the celestial sphere include the celestial equator (dividing the sky into northern and southern hemispheres), the north and south celestial poles (points around which the sky appears to rotate), and celestial coordinates (such as right ascension and declination) used to locate objects in the sky. Additionally, the ecliptic (the apparent path of the Sun) intersects the celestial equator at two points known as the vernal and autumnal equinoxes.
To calculate the Lagrange points in a celestial system, one can use mathematical equations that consider the gravitational forces between the celestial bodies involved. These points are where the gravitational forces of two large bodies, such as a planet and a moon, balance out the centrifugal force of a smaller body, like a spacecraft. There are five Lagrange points in a celestial system, labeled L1 to L5, each with specific calculations based on the masses and distances of the bodies in the system.
Moving objects or celestial bodies such as stars can also be used as reference points in navigation and positioning. These objects can provide constant or predictable movement that can help determine direction or orientation.
== == Through any two points there is exactly one straight line.
If Earth did not rotate, the celestial poles would align with the geographic poles, and the celestial equator would align with Earth's equator. The celestial poles are points in the sky that the Earth's axis points towards, and the celestial equator is an imaginary line in the sky directly above the Earth's equator. Without Earth's rotation, these references would be fixed in the sky.
Those would be the "equinoxes".
june 21 december 21
Exactly.
No. A tangent touches the circle at exactly one point. A line that intersects a circle at exactly two points is a secant.