It comes from Greek apo- which means "away from". Thus "aphelion" is the point in a body's orbit when it is farthest away from the Sun (helios) and "apogee' is the point where a body orbiting the Earth is farthest from the Earth (geos).
aphelion
AP SSC means Andhra pradesh Secondary School Certificate. It is also known as the 10th Board Exam, which is a public examination for students of the senior class or class 10 conducted in Andhra Pradesh, India.
nalla . kiran kumar reddy
fact from e2020 AP Environmental Science quiz
The absolute refractory period (ARP) is important because it keeps the action potential (AP) moving in one direction down the axon. Imagine a neuron in which the AP progresses from left to right. For simplicity, let's number the leftmost area of the neuron as 1 and the rightmost as 5, like on your right hand on a keyboard. Let's consider the AP at Area 3. At this point, Area 2 is in ARP, meaning the voltage-gated Na channels are inactivated. This prevents the Na influx necessary for an AP there. In contrast, the Na channels at Area 4 are available (i.e., they aren't inactivated), and will open in response to local current coming from Area 3. So Na will then rush into the neuron at Area 4, and the AP continues in that direction. The ARP also limits the neuron's maximum firing frequency, which is relevant to encoding stimulus intensity. This stuff isn't easy. I hope that helps.
Farthest: Aphelion (pr. ap-helion).
That is perihelion. Furthest away is aphelion, pronounced ap-helion. For each planet, perihelion and aphelion are at opposite ends of the major axis of the elliptical orbit.
Actually, the Greek prefix "helio-" means sun, while the prefix "ap-" can mean "away from" or "separate." So, "ap-" is not specifically related to the sun.
ap supine
The abbreviation "AP" in the phrase "AP diameter" means from front to back.
ap supine
aphelion
The prefix ap- mean to or toward. One word with this prefix is appetite.
The Aphelion.
Aphelion is the point in a planet's or comet's orbit where it is farthest from the Sun. The Earth's aphelion is 152,098,232 km.
AM AP means in the morning before eating.
It is about 249,209,000 kilometers from the Sun, at aphelion.