楼主天冷了。夜里要记得盖好被 子。 　　 不一定要穿的很美。但一定要暖和。 　　 洗澡的前要记得先把水的温度调好。 　　 不要再吃太多凉的水果了。 　　 如果感冒了一定要去医院吃药。 早上起床的时候不要猛一下把被子掀开 。那样容易着凉。 　　 洗完头一定要等到头发干了出门。

没人解释一下，光速变化的这个实验吗？

光速变化和相对论有个毛关系。

首先这个实验如何避免仪器误差，如何避免仪器本身由于参照系不同导致的结果不同
其次罗默木蚀是否计算了光由于引力导致的非直线运动，在计算了之后是否符合观测
没有正式实验数据出来之前一切都难说，设计更精密的实验永远是最高的追求

wiki里Rømer's determination of the speed of light词条中的Modern discussion项目自己看看吗。。。。。。。
我看了百度百科中直接把这段儿掐了。。。。不知哪个家伙干的。。对了，中文wiki里也没有最后的一段。。。

Did Rømer measure the speed of light?
Several modern discussions have suggested that Rømer should not be credited with the measurement of the speed of light, as he never gave a value in Earth-based units.[15] These authors credit Huygens with the first calculation of the speed of light.[16]
Huygens' estimate was a value of 110,000,000 toises per second: as the toise was later determined to be just under two metres, this gives the value in modern units.
However, Huygens' estimate was not a precise calculation but rather an illustration at an order of magnitude level. The relevant passage from Treatise sur la lumière reads:

If one considers the vast size of the diameter KL, which according to me is some 24 thousand diameters of the Earth, one will acknowledge the extreme velocity of Light. For, supposing that KL is no more than 22 thousand of these diameters, it appears that being traversed in 22 minutes this makes the speed a thousand diameters in one minute, that is 16-2/3 diameters in one second or in one beat of the pulse, which makes more than 11 hundred times a hundred thousand toises;[17]
Huygens was obviously not concerned about the 9% difference between his preferred value for the distance from the Sun to Earth and the one he uses in his calculation. Nor was there any doubt in Huygens' mind as to Rømer's achievement, as he wrote to Colbert (emphasis added):
I have seen recently, with much pleasure, the beautiful discovery of Mr. Romer, to demonstrate that light takes time in propagating, and even to measure this time;[8]
Neither Newton nor Bradley bothered to calculate the speed of light in Earth-based units. The next recorded calculation was probably made by Fontenelle: claiming to work from Rømer's results, the historical account of Rømer's work written some time after 1707 gives a value of 48203 leagues per second.[18] This is 16.826 Earth-diameters (214,636 km) per second.
Doppler method
It has also been suggested that Rømer was measuring a Doppler effect. The original effect discovered by Christian Doppler 166 years later[19] refers to propagating electromagnetic waves. The generalization referred to here is the change in observed frequency of an oscillator (in this case, Io orbiting around Jupiter) when the observer (in this case, on Earth's surface) is moving: the frequency is higher when the observer is moving towards the oscillator and lower when the observer is moving away from the oscillator. This apparently anachronistic analysis implies that Rømer was measuring the ratio c⁄v, where c is the speed of light and v is the Earth's orbital velocity (strictly, the component of the Earth's orbital velocity parallel to the Earth–Jupiter vector), and indicates that the major inaccuracy of Rømer's calculations was his poor knowledge of the orbit of Jupiter.[19]
There is no evidence that Rømer thought that he was measuring c⁄v: he gives his result as the time of 22 minutes for light to travel a distance equal to the diameter of Earth's orbit or, equivalently, 11 minutes for light to travel from the Sun to Earth.[2][5] It can be readily shown that the two measurements are equivalent: if we give τ as the time taken for light to cross the radius of an orbit (e.g. from the Sun to Earth) and P as the orbital period (the time for one complete rotation), then
Bradley, who was measuring c⁄v in his studies of aberration in 1729, was well aware of this relation as he converts his results for c⁄v into a value for τ without any comment.[14]
不知道有没有奇怪的符号，撮合着看