Science is absolute. Everything in nature has a precise mechanism. Description and assumption are not mechanisms. Science must be based on fact and logic, cause and effect.

Modern science is based on the assumptions that light is EM wave/photon traveling in vacuum space at light speed. Gravity is mass curving space. Gravity can deflect the light path. Gravity can attract light. Gravity can slow down time. Space tells mass how to move. Mass tells space how to curve. Mass is equal to energy. Sun is a fusion reactor.

History of measurements of c (in km/s)

<1638	Galileo, covered lanterns	inconclusive[115][116][117]:1252[Note 13]
<1667	Accademia del Cimento, covered lanterns	inconclusive[117]:1253[118]
1675	Rømer and Huygens, moons of Jupiter	220000[90][119]	‒27% error
1729	James Bradley, aberration of light	301000[100]	+0.40% error
1849	Hippolyte Fizeau, toothed wheel	315000[100]	+5.1% error
1862	Léon Foucault, rotating mirror	298000±500[100]	‒0.60% error
1907	Rosa and Dorsey, EM constants	299710±30[105][106]	‒280 ppm error
1926	Albert A. Michelson, rotating mirror	299796±4[120]	+12 ppm error
1950	Essen and Gordon-Smith, cavity resonator	299792.5±3.0[108]	+0.14 ppm error
1958	K.D. Froome, radio interferometry	299792.50±0.10[112]	+0.14 ppm error
1972	Evenson et al., laser interferometry	299792.4562±0.0011[114]	‒0.006 ppm error
1983	17th CGPM, definition of the metre	299792.458 (exact)[88]	exact, as defined

Scientists never measured light speed in vacuum space. Scientists thought light is something traveling in space at light speed. The fact is light is vibrating electrostatic force carried by vibrating atoms, light must coexist with matter/medium, there is no light in vacuum space.