Why does the moon appear to move alongside you?

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You know, when you’re either walking, driving, or otherwise moving around at night the moon appears to be “following” you. I would assume it’s due to the scale/distance or something internally in our bodies related to coordination.

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3 Answers

Anonymous 0 Comments

Essentially, it’s related to the insane distance of the moon.

When your face is pressed right up against your phone, it’s right in front of your face, and pretty close. When you move your face to the right, the phone is no longer right in front of your face. Instead, since you moved to the right about the same distance as the phone’s original distance from your face, the phone is now in front, and to the left of your face. It looks sort of like this:

>Face—Phone

becomes

>Face
>
>-
>
>———Phone

A pretty noticeable change. On the other hand, the moon is insanely far away. Like, insanely far. So far it would take a month of driving towards it to reach it. So, when you start, the moon is in front of your face, like this:

>Face———————————————————Moon

So now, when you walk a few streets down, you’re barely moving relative to your starting distance. It looks sort of like this:

>Face
>
>—————————————————————-Moon

The moon is still essentially in front of you, not beside you. This janky demo is extremely exaggerated too. If this were to scale, you’d move less than a pixel.

In a more advanced way of saying it, the farther away something starts, the less a small change in position will affect its angle (and therefore where it appears in your vision)

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