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You cannot prove or disprove the constancy of lightspeed using the scientific method given limiations of the human lifespan. In fact, the only hard data available seems to indicate it is decreasing slightly though we are certainly free to question the methodologies used for the various tests over the centuries..

Its late and I haven't shaved, so I will address only this small part of your post.

Science does not prove things; it is in the business of trying to disprove things. As for the speed of light, nobody is trying to "prove" it, rather the efforts are at measuring it more and more accurately. It it turns out to be a declining variable, so be it. But, at this point there is no good evidence that is the case.

I think you will find that most of us on the evolution side are quite patient with reasonable discourse, but we tend to go ballistic when we see the same nonsense presented uncritically for the thousandth time.

I personally tend to go off when somebody quotemines a creationist website for some absolute drivel on radiocarbon dating, as that is something I do a lot of and have a lot of experience with. I just don't have patience for some neophyte who thinks he can go to some creationist website, load up on nonsense, and trump 35 years of study.

Good night. We will discuss these issues again I am sure.

Small nitpick: the speed of light is exactly 299,792,458 m/s. That's because since 1983, the definition of a meter has been re-defined as the distance light goes in a vacuum in 1/299,792,458th of a second. There are no more refining measures of light.

This is going too late for me; I've got to wake up somewhat early. Pleasure talking with everyone.

You cannot prove or disprove the constancy of lightspeed using the scientific method given limiations of the human lifespan. In fact, the only hard data available seems to indicate it is decreasing slightly though we are certainly free to question the methodologies used for the various tests over the centuries..

Don't underestimate the cleverness of scientists. Read Supernova 1987A Refutes 6000 Year Old Universe.

We have now established by trigonometric measurement that SN1987A is at a distance of about 167,000 light years and verified the speed of light is not significantly changed since the time and place of SN1987A. This demonstrates that the events surrounding Supernova 1987A took place some 167,000 years ago and YEC is therefore falsified.

The basic argument is that the distance can be established by comparing the brightness of Cepheid variable stars and by other means that do not depend on the speed of light. The light from the supernova illuminates a ring around it, and the speed of this light can be calculated by using trig. It's the same value we find now on the earth.