@M.A.R.ಠ_ಠ I fear I'm going to regret this question, but... what is 'The Edge of Darkness'? Is that a soap opera about a group of men and women who live and love on a dilithium mining colony on Mercury right at the sun-facing threshold (night-day)? And the complications that arise in their living circumstances when they realize that Mercuruy is
not tidally locked and in fact has a 3:2 rotation-revolution ratio
(or is it the other way around?).