41C sunrise/sunset program listing: what are these strange "dot" steps?

[rprosperi]

(05-23-2020 01:01 AM)Dave Britten Wrote:  It doesn't look like a decimal point used elsewhere in the listing, but is that all it is? And if so, what's the significance of using a lone decimal point instead of 0?

It executes faster then entering 0. Although this is not synthetic (you just type [.]) it is similar to using E instead of 1 (this is synthetic). They both simply execute faster in a program.