03-09-2023, 06:35 PM
I use the following: here " t " is the meridian angle either east or west
Sin(Hc) = Sin(L)Sin(d) + Cos(L)Cos(d)Cos(t)
Tan(Z) = Sin(t) / [Sin(L)Cos(t) – Cos(L)Tan(d)]
When I do sight redcution by calculator I find it useful to begin by making a small table. I put " L, D and t" across the top row and "sin cos and tan" down the first column. I then populate the table with values to five decimal places. Tan(L) and Tan(t) are not used. It may seem like extra busy work but it sure makes it a lot easier to ferret out blunders later on!
Sin(Hc) = Sin(L)Sin(d) + Cos(L)Cos(d)Cos(t)
Tan(Z) = Sin(t) / [Sin(L)Cos(t) – Cos(L)Tan(d)]
When I do sight redcution by calculator I find it useful to begin by making a small table. I put " L, D and t" across the top row and "sin cos and tan" down the first column. I then populate the table with values to five decimal places. Tan(L) and Tan(t) are not used. It may seem like extra busy work but it sure makes it a lot easier to ferret out blunders later on!