The speed of light is a function of time.

Introduction

The sub-sections reached from this Introduction page discuss some of the general considerations relative to the behavior of light.

The following quotes from Relativity The Special and the General Theory by Albert Einstein (15th edition, Crown Publishers, Inc, New York) are presented here so that the reader might feel more comfortable in setting aside preconceived ideas while reading the discussions in this site:

"From this we conclude, that, in general, rays of light are propagated curvilinearly in gravitational fields." (pg 75)

"In the second place our result shows that, according to the general theory of relativity, the law of the constancy of the velocity of light in vacuo, which constitutes one of the two fundamental assumptions in the special theory of relativity and to which we have already frequently referred, cannot claim any unlimited validity. A curvature of rays of light can only take place when the velocity of propagation of light varies with position." (pg 76)

A Thought Experiment shows that inconsistencies occur when the speed of light is considered to be a fixed value.

The Moving Train takes a look at the discussion of simultaniety.

Introduction presents the introductory comments for the ideas presented in this site, and provides some background to the considerations made in the ensuing discussions.