[RightWhale]

How are the Cepheid variables of historical interest?

[Creationist]

The ones documented would have interest. But then as someone said about scientist over a hundred years ago would their instruments be as accurate as todays, or tomorrow's or next century.My point about measuring distance to a star that is many light years away is when you make the triangle (measure in June and December)the angle is only about 1 degree or if you were to draw it to scale it would look like a straight line.

Two straight lines of 100 light years long with a base of around 187 million miles.

That would be like two people standing at arms length looking at an object 10 miles away (this is an example not a scaled down proof), and triangulating the distance.