So I'm trying to understand something about the Hulse Taylor Binary. Here they talk about the change in periode that actually changes with the period. So what does P(adsbygoogle = window.adsbygoogle || []).push({}); _{t}mean here?

And what is actually being explained? P_{1year}also makes no sense to me. Is that the period after one year? And what is deltaP_{1year}?

I'm sorry but I'm quite confused about the formula.

Thx for any help

http://astronomy.stackexchange.com/...is-cumulative-periastron-time-shift-calculate

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# I What does Pt mean in this formula?

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