Perihelion used in a sentence

Perihelion in a sentence as a noun

I guess its because the comet is near perihelion.

What the heck was that thing's velocity at perihelion?

I was under the impression that they thought the lander would be blown off the comet when it starts to shed ice and debris in large amounts around perihelion.

Mercury is in a more elliptical orbit; its 'tidally locked' at the perihelion but when its further away it gets a half-turn in.

On this day, the Earth is roughly halfway from aphelion to perihelion, so experiences its greatest orbital acceleration.

Then, at aphelion, when the ship's orbital velocity is lowest, you reduce the ship's orbital velocity to drop it's perihelion inside the sun.

Other spacecraft, such as Helios 1 & 2, can also be measured as the fastest objects, due to their orbital velocity relative to the Sun at perihelion.

When the Earth is near perihelion in January, it moves faster and farther each day along its orbit, so needs an extra few seconds for more rotation to bring your spot on the surface back under the noon Sun.

I learned that perihelion movement can only be explained by general relativity, not newtonian mechanics.

The period between solar noons oscillates and varies up to tens of seconds away from precisely 12 hours, thanks to the differing orbital speed of the Earth between perihelion and aphelion.

Often, observations are made by a sufficiently large body of people and correlated with enough physical evidence to make it as solid as the advance of Mercury's perihelion.

At any given perihelion, the earth has only a small chance of being in the right part of its orbit, but eventually...I'm not saying it's a big risk; the chance of a catastrophic launch malfunction is probably a lot greater.