query: How did people estimate the speed of light before modern technology?
positive_passages.docid: 79199
positive_passages.text: How did Rømer measure the speed of light by observing Jupiter's moons, centuries ago?
negative_passages.docid: 57608
negative_passages.text: Approaching speed of light: why do objects appear further away in front of me?
negative_passages.docid: 128649
negative_passages.text: How did we 'discover' dark matter?
negative_passages.docid: 61714
negative_passages.text: Can One-Way Speed of Light be Instantaneous?
negative_passages.docid: 62039
negative_passages.text: What does a sphere moving close to the speed of light look like?
negative_passages.docid: 93109
negative_passages.text: Short story: invention of a device to view the past
negative_passages.docid: 77578
negative_passages.text: How to get the accurate relativistic momentum form for photons?
negative_passages.docid: 45953
negative_passages.text: How can I explain the scientific basis of the constant speed of light to a $c$-decay proponent?
negative_passages.docid: 14036
negative_passages.text: What is so special about speed of light in vacuum?
negative_passages.docid: 35663
negative_passages.text: Is there a formula that gives the position of an object depending on the time, but which doesn't allow the object to surpass the speed of light?
negative_passages.docid: 112000
negative_passages.text: How do we know the Flash is faster than Superman?
negative_passages.docid: 12267
negative_passages.text: (Almost) double light speed
negative_passages.docid: 64226
negative_passages.text: If traveling at the speed of lights stops time, why does it take light 8 minutes to reach Earth?
negative_passages.docid: 115572
negative_passages.text: Theoretical proof of the constant of speed of light $c$ in vacuum in all frames of references
negative_passages.docid: 13757
negative_passages.text: Is there a device that could measure the speed of time?
negative_passages.docid: 33110
negative_passages.text: The origin of the value of speed of light in vacuum
negative_passages.docid: 56911
negative_passages.text: Proving invariance of $ds^2$ from the invariance of the speed of light