In any case, the precision required was quite doable with 1700s technology. An amateur could do it today, at very low cost - what you need is persistence to follow through with a long term project.

You are welcome, please zip the whole file folder of this specific project to support@d5techs.com. We may need to look into the scene to check the light position, and the materials you use, like the screenshot from paperless, the problem can be caused by different reasons.

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Also, I noticed that some lights are built in to the wall, which means they are overlapped with meshes, please change their position to improve the scene stability.

Reflection, refraction diffraction

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same problem of reflections. In my case the lamp has a foliage material and an omni light inside D5_Image_20221126_1359421078×716 164 KB

Broadly speaking, parallax is a position-based effect, whereas aberration is a speed-based effect. It makes sense that they are out of phase by 90 degrees (remember trigonometry?)

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Go to the site by Prof. Seligman, link above, and look at the two diagrams showing the aberration and the parallax. In point B (in April), the star is in the middle of the ellipse due to parallax, but it's at the right-hand tip of the ellipse due to aberration.

What isreflection

Proper motion appears as a long-term drift of stellar positions that remains even after you subtract aberration, parallax, nutation, etc. There's a back-and-forth-back-and-forth from aberration and parallax, whereas proper motion keeps going in one direction only.

Hi mate, I opened your scene file but did not find the same bulb as shown in your screenshot, can you show me where they are? image724×554 79.8 KB

For further troubleshooting, we may need you to send this scene file to our support center (support@d5techs.com), since we need to check the mirror material, as well as the position of the lights to figure out why this issue happens.

The speed of earth is about 30km/s. That means the deviation from the real position of a star is about 30/300000 rad =180*3600/3.14159/10000 ~20arcsecond.

That value for aberration of starlight is "horrible" in two ways: One, in that's is very small. And two, in that it's large enough to interfere with parallax measurements.

Total internalreflection

The thing is, in the photo attached, I encountered the same problem but my solution was to clone it on the reflection so it’s the same, using photoshop. but it would be great if I know why these weird reflection is happening.

The light object was already invisible in reflection. It would be great if we can know why these problems are happening.

OTOH, it was an additional source of error, until speed of light and the Earth's orbital parameters were very precisely determined. Perhaps it still contributes to the noise added to the data, to some extent - I'm not entirely sure here.

Polarization of light

Now, small as that value is, it's still 20 arcsec. The resolving power of early telescopes (and modern amateur telescopes) is 1 arcsec or better - which is more than enough. What you need is a very solid mount with good setting circles. Lacking that, you could build a telescope with a fixed position, very rigid, forever pointing at the same place in the sky - that's what Hooke did - and then you're only limited by resolving power.

In the early 1700s, Bradley attempted to make a more precise measurement of parallax, and did obtain significant data, but the variations in the star positions were out of phase with the model. Using the speed of light estimate by Ole Roemer from Hooke's time, he correctly proposed that this was not parallax, but a speed-of-light phenomenon, now known as the aberration of starlight.

Basically, aberration of starlight produces the same variation in the positions of all stars, a periodic elliptic "wobble" that is the same for all stellar objects. Parallax produces a similar kind of wobble, but the amplitude depends on the distance to the star, and the phase is different from the aberration's.

Yeah, sort of. You know, at any given moment, the size and the direction of it. So you could simply subtract it from the measured position of the star you're watching.

You could measure proper motion with relatively short term observations, but it only works for stars that are nearby and are moving fast. If you're willing to wait decades, proper motion is much more easy to measure.

Refraction of light

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By the way, what file/s do you need exactly? Shall I just zip the whole D5 File of this specific project? Thanks Oliver!

In the late 1600s, scientists had already adopted the heliocentric model, and so were looking to measure the distance to the stars via parallax. Robert Hooke was among the first to attempt it, and probably the first to claim a measurement of the parallax. His observations were not very convincing at that time, but he probably did observe some effects from aberration of starlight (though they didn't know such a thing existed back then).

Generally we should not worry about the light aberration, right? Even space telescopes have reference stars. The position of the reference stars are fixed. So although there are detectable wobble(20") in one year , because we use reference stars, this kind of effect is removed every day immediately. Every night, when the night assistant lets a telescope point at some direction, he has to use reference stars to calibrate that night's pointing.

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Diffusereflection

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Aberration per se is easy to explain via the old analogy to running through the rain. When you're standing, rain falls vertically. When you're running, rain appears to come from a different direction. Same with starlight. Like in this diagram (by Professor Courtney Seligman, linked above):