10-02-2018, 12:43 AM
Fellas,
I forgot to mention the time signals at 2.5 mHz, 5 mHz, 10 mHz, 15 mHz and 20 mHz (WWV)
There's also WWVH (Hawaii). I you look in The Nautical Almanacs found on this site you'll see on page 6 (Useful Information) the frequency list for both stations. You'll need a SW (Short Wave) receiver to get the signals.
There's talk of shutting down both stations for govt. budget reasons.
That being said....what do you do if you don't have a watch that's accurate or is in error? Well, you could make a great effort to learn Lunars or....try the following formula.
Caution! I've been working on these formulas and they have proven to be very accurate in establishing the time within 3 or 4 seconds. You must know your exact latitude and longitude or it just wont give you the correct time of the observation. I have no idea what results they will yield in any other hemisphere except Northern and Western (northern). The formulas as presented below are as they would be entered into the Casio fx-300es calculator. Good luck!
Recovery of Time using GHA
If Zn is < 180°
NOTE! If GHA of Integral hour is before MP at Greenwich then do not use the second – 360° (minus 360 degrees)
GHA Integral Hour + ((360º – Cos-1((Sin(Hc or Ho) – Sin(latitude) x Sin(declination)) ÷ Cos(AP latitude) x Cos(declination)) + longitude – 360º – GHA of Integral Hour) ÷ 15
If GHA of Integral hour is before MP at Greenwich then do not use this formula;
GHA Integral Hour + ((360º – Cos-1((Sin(Hc or Ho) – Sin(latitude) x Sin(declination)) ÷ Cos(AP latitude) x Cos(declination)) + longitude – GHA of Integral Hour) ÷ 15
If Zn is > 180°
GHA Integral Hour + (Cos-1((Sin(Hc or Ho) – Sin(latitude) x Sin(declination)) ÷ Cos(AP latitude) x Cos(declination)) + longitude – GHA of Integral Hour) ÷ 15
I forgot to mention the time signals at 2.5 mHz, 5 mHz, 10 mHz, 15 mHz and 20 mHz (WWV)
There's also WWVH (Hawaii). I you look in The Nautical Almanacs found on this site you'll see on page 6 (Useful Information) the frequency list for both stations. You'll need a SW (Short Wave) receiver to get the signals.
There's talk of shutting down both stations for govt. budget reasons.
That being said....what do you do if you don't have a watch that's accurate or is in error? Well, you could make a great effort to learn Lunars or....try the following formula.
Caution! I've been working on these formulas and they have proven to be very accurate in establishing the time within 3 or 4 seconds. You must know your exact latitude and longitude or it just wont give you the correct time of the observation. I have no idea what results they will yield in any other hemisphere except Northern and Western (northern). The formulas as presented below are as they would be entered into the Casio fx-300es calculator. Good luck!
Recovery of Time using GHA
If Zn is < 180°
NOTE! If GHA of Integral hour is before MP at Greenwich then do not use the second – 360° (minus 360 degrees)
GHA Integral Hour + ((360º – Cos-1((Sin(Hc or Ho) – Sin(latitude) x Sin(declination)) ÷ Cos(AP latitude) x Cos(declination)) + longitude – 360º – GHA of Integral Hour) ÷ 15
If GHA of Integral hour is before MP at Greenwich then do not use this formula;
GHA Integral Hour + ((360º – Cos-1((Sin(Hc or Ho) – Sin(latitude) x Sin(declination)) ÷ Cos(AP latitude) x Cos(declination)) + longitude – GHA of Integral Hour) ÷ 15
If Zn is > 180°
GHA Integral Hour + (Cos-1((Sin(Hc or Ho) – Sin(latitude) x Sin(declination)) ÷ Cos(AP latitude) x Cos(declination)) + longitude – GHA of Integral Hour) ÷ 15