Apex (Noun)
Meaning 1
The point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars.
Classification
Nouns denoting spatial position.
Examples
- The direction of the apex of the sun's motion through space has been calculated with high precision using observations of the nearby stars.
- The solar system's motion towards the apex has a speed of about 20 kilometers per second relative to the fixed stars.
- In order to account for the solar system's velocity, astronomers often need to adjust the position of stars relative to the apex of the sun's motion.
- Measurements of the position and motion of the stars in the constellation Hercules can be used to estimate the direction of the apex.
- Due to the precession of the equinoxes, the apex of the sun's motion will appear to shift slightly over the course of many millennia.
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Meaning 2
The highest point (of something); "at the peak of the pyramid".
Classification
Nouns denoting spatial position.