How Earth Moves

What people said

Strong rec Ciprian Tomoiagă · 2016-12 · Physics Stack Exchange · on “Why wouldn't the part of the Earth facing the Sun a half year before be facing away from it now at noon?”

This excellent video by VSauce explains here [this video] what a day is. I recommend you watch all of it, it explains very well everything you want to know about time.

Recommends Dhruv Saxena · 2017-03 · Physics Stack Exchange · on “How many minutes in a year?”

You might probably like this video [this video] containing very intuitive explanations for Solar Day, Sidereal Day, Leap Year and more.

Recommends Dhruv Saxena · 2017-05 · Astronomy Stack Exchange · on “Why the continued obsession in measuring the year as a multiple of days?”

_How do you know what a year is without a calendar?_ - see Sidereal Time [LINK] and Sidereal Year [LINK] . You might also find this Vsauce video [this video] informative (which, in a way, augments the comment above and the answers below - mankind taking control of how we want to define what a day / year is).

Recommends msb · 2018-11 · Astronomy Stack Exchange · on “In which direction is the sun travelling?”

Relative to your drawing, the sun is moving south-ish: [LINK] The solar system is tilted about 60 degrees of the milky way plane, on which it's moving around like everyone else. Here is another example/explanation. [this video] To know which star is closest, you'd have to define what "closest" mean. Are we setting a straight line and seeing if it hits any star? If a start is 50 light years away from that straight line and 100 light years away from the sun, is that closer than a start that's 5 light years away from line but 800 light years away from the sun? The video above says we're moving towards Vega, I don't know how satisfactory this information is to you. The milky way center is to the righ

Recommends Hoki · 2020-09 · Astronomy Stack Exchange · on “Why are the time zones calculated as 360°/24 and not 361°/24 or 360°/23.933?”

I'd recommend watching this video: How Earth Moves [this video] . He goes on a bit at time but he goes over many of the 'arbitrary' choices human ended up doing in order to keep time counting manageable for non astronomers. He also have animations which explain quite visually the difference between sidereal and solar days.

Cites Vishnu JK · 2016-07 · Physics Stack Exchange · on “Is Earth continuously changing its orbit size i.e, circumference of the orbit?”

Is Earth's orbit changing? Yes. But not large enough to alter our calendar in near future Well, there are some long-period oscillations, but those are very small, and don't imply that we're systematically moving towards or away from the Sun. From Ask An Astronomer [LINK] : There is an effect which is making us move very slowly away from the Sun. That is the tidal interaction between the Sun and the Earth. This slows down the rotation of the Sun, and pushes the Earth farther away from the Sun. The principle for the Sun-Earth system should be the same. But how big of an effect is this? It turns out that the yearly increase in the distance between the Earth and the Sun from this effect is only

Cites Paul · 2017-01 · Physics Stack Exchange · on “Finding center of the universe or which direction Earth travels in space”

My limited understanding is: Photons travel at the speed of light (c). If we could theoretically (for the sake of argument) travel at the speed of light minus 1km/h (c-1km/h). And we turn on a flash light attached to our wing and it flashes both directions straight ahead and backward. Then the light in front of us would travel at 1km/h? How about the one in the back? would it go at the speed of 2c-1km/h relative to us? Now in the above paragraph I mentioned speed of light minus 1km/h. I'm still unsure how our speed gets measured - relatively to which point in universe? Because from our perspective we would hold still (if we’re not accelerating) and the objects around us would be moving at ap

Cites Sha59 Maa · 2018-01 · Astronomy Stack Exchange · on “If the Earth is rotating counter clockwise, how does the sun rise from east?”

I was very confused when I watched this video from 2:18 till 2:45 [this video] . And it seems very clear that if the Earth is really rotating from west to east, shouldn't be the Sun rising from west and setting in east? We all know certainly that the sun rises from east, but how come Earth is rotating in the way as shown in the linked video? PS: I somehow feel very stupid for asking this question...

Cites piRSquared · 2019-12 · Physics Stack Exchange · on “Variance of earth's rotational speed due to tidal effects”

I recently watched a video that explained how the length of the day was impacted by where the Earth was at in its orbit around the Sun. Consider a "day" for a point on Earth the period from when the Sun is at a highest point to the next time the Sun is at a highest point. The length of this day varies over the course of the year, getting longer when Earth is closer to the Sun and shorter when Earth is furthest from the sun. See Vsauce: How Earth Moves [this video] However, I got to thinking. As the tidal effects from the Moon and Sun change the shape of the Earth (most directly through the oceans), the moment of inertia must also be changing and therefore the speed of the Earth's rotation must be

Cites knowledgeseeker · 2021-01 · Astronomy Stack Exchange · on “Does the earth spiral around the sun's movement/motion path?”

I have watched the following video (How Earth Moves by Vsauce) regarding how earth moves: I have some questions: Does the earth spiral around the sun's path as it is shown in the video (exact time is 19:49) and screenshots? Is the spiraling movement caused by sun movement (on its path shown above) where the sun is dragging the earth (and other planets). Does the earth go in front of the sun then back, then fourth and back like it is shown on the video? I see both the sun and earth racing with each overtaking the other over and over. Is this assumption true? In this manner, would earth, at one point in time , be closer to the destination where the solar system is heading (I think they call th