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2008 Nautical Almanac.pdf

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  Generated by PyAlmanac   Author: EnnoRodegerdtsDecember 1, 2014 downloaded from:  TheNauticalAlmanac.com Disclaimer: These are computer generated tables. Use on your own risk. The accuracy has been checked as good as possible but can not be guaranteed. This means, if you get lost on the oceans because of errors in this publication I can not be held liable. or security rele!ant applications you should buy an official !ersion of the nautical almanac. The Nautical Almanac ##$  Celestial Navigation  useful Formulas  About Calculators The Casio  fx-300ES Plus   is an inexpensive calculator at about 11 USD. It features natural input   soyou enter a formula just as it would be written on paper. nterin! de!rees minutes and seconds isvery simple. The Casio  fx-300ES Plus has # memory locations and you can review many of theprevious entries you ma$e usin! a special $ey on the calculator. Determine Hc using a calculatorThe formula %c & asin'sin( Declination )*sin( Latitude ) + cos( Latitude )*cos( Declination )*cos( LHA ), As it would be entered into the Casio calculator Sin-1(Sin( Ap Latitude ) x Sin( Declination ) + Cos( Ap Latitude)  x Cos( Declination ) x Cos( LHA ) Declination   is the declination of the Celestial body youre observin!. /hen the heavenly bodys declination is Contrary name   to your 0p atitude enter a ne!ative si!n before it. Latitude   is the atitude where you are thin$ you are or where you would li$e to determine %c for.Typically youll be usin! an Assumed position Latitude or Ap Latitude   as its called. In Western Longitudes LHA   is the ocal %our 0n!le which is derived from subtractin! your whole number value of on!itude (0ssumed or otherwise) from the whole number value of GHA   (2reenwich %our 0n!le). In astern Longitudes LHA , i  n Eastern Longitudes, is determined by roundin! up the 2%0 3!ure to the next hi!hestwhole de!ree 3!ure then addin! the D4. on!itude to 2%0 to obtain %0. 5nly add the wholede!ree D4. on!itude 3!ure to the rounded up whole de!ree 2%0 3!ure. If the resultin! %03!ure is !reater than 6789 then subtract 6789 from the 3!ure to obtain the %0. Wh! would !ou want to determine Hc using a calculator Its faster than loo$in! up in :ub. ;o. <=# and :ub. ;o. <<# hi!hly accurate and you dont need alot of printed out pa!es of atitudes from :ub. ;o. <=# and :ub. ;o. <<#. :ub. ;o. <=# >ol. < ? 6dont cover any declination !reater than <# de!rees so youd have to use :ub. ;o. <<# which isextremely lar!e.  Celestial NavigationDetermine # @ & acos'(sin( Declination ) A sin( Ap Latitude)  x sin( Hc )) B (cos( Ap Latitude ) x cos( Hc )), As it would be entered into the Casio calculator$$$ Cos-1((Sin( Declination ) A Sin( A%   Latitude ) x Sin( Hc ))   B (Cos( A% Latitude ) x Cos( Hc )If the heavenly bodys declination is Contrary name   to the 0p atitude enter a ne!ative si!n before it. To obtain #n see the rules below for Northern and &outhern latitudes . Determine # independent of Hc “L”   is latitude and  d”   is declination. /hen the heavenly bodys declination is Contrary name   to your 0p atitude enter a ne!ative si!n before it. As it would be entered into the Casio calculator$$$ @ & tan-1 ((sin ( LHA ) B  (cos( A% latitude ) x tan( declination ) A (sin( A% latitude ) x cos( LHA ))The si!n convention used in the calculation of this aimuth formula is as followsE from Bodit! C apter ## CALC$LA%&'(S A() C'(*E+S&'(S, pae 33 1) If latitude and declination are of contrary name declination is treated as a ne!ative FuantityG<) If the local hour an!le is !reater than 1H89 it is treated as a ne!ative Fuantity. If the aimuth an!le as calculated is ne!ative add 1H89 to obtain the desired value.   To obtain #n appl! the following rules   In Northern Latitudes  %0 !reater than 1H89....@n&@ %0 less than 1H89...........@n&6789 A @ In &outhern Latitudes  %0 !reater than 1H89....@n& 1H89 A @ %0 less than 1H89...........@n& 1H89 + @ Determine 'efraction 8.#7 B  Tan of (%a) Determine Dip using feet 8.# x (SFuare 4oot of   .e   (%ei!ht of ye) in feet) Determine Dip using meters 1.7 x (SFuare 4oot of .e (%ei!ht of eye) in meters )  fair inds///!lear sies and folloin seas  TheNauticalAlmanac$com  Explanation of The Nautical Almanac Daily Pages 1Date based on GMT/UT2Time based on GMT/UT (this is just integral hour only)3 Mer. pass - meridian passage o !ries at the rime Meridian- Green#i$h- %&' Time gure is GMT/UT'G*! v    $orre$tion and De$lination d $orre$tion' The amount to $orre$t v and d   or is determined by theminutes and se$onds o time o the planet obser+ation and is ound in the Increments and Corrections  pages o The ,auti$al !lmana$' The n$rements and .orre$tions pages are also no#n as The Yellow Pages   as that0s the $olor o the paper in the U, published ,auti$al !lmana$'a m- is the magnitude or brightness o the planet' ! bright planet #ill ha+e a minus sign beside the gure' !ainter planet #ill ha+e no sign beside its magnitude gure' Stars - SHA , Sidereal Hour Angle  4 and Declination ' 5 stars are listed' Typi$ally4 only 6 stars are used orna+igational purposes in both ,orthern and outhern *emispheres'7 Mer. pass - planet meridian passage time at the rime Meridian- Green#i$h- %&' Time gure is GMT/UT'6 SHA- planet SHA  at the time o meridian passage at the rime Meridian- Green#i$h- %&' lanet *! is$al$ulated by subtra$ting planet G*! rom !ries G*!' Time gure is GMT/UT'8 Horizontal parallax - or 9enus and Mars' 5Date based on GMT/UT1%Time based on GMT/UT (this is just integral hour only)11 SD - emi-diameter o the un' ne hal o the angular #idth o the un as obser+ed on earth' 12  - the amount the de$lination o the un $hanges per hour'  there0s a minus sign beside the de$lination gure in the Dec $olumn then the un is in the outhern hemisphere'13The Moon0s G*! v    $orre$tion' The amount to $orre$t the Moon0s G*! using v is determined by theminutes and se$onds o time o the Moon0s obser+ation and is ound in the Increments and Corrections  pages o The ,auti$al !lmana$' The n$rements and .orre$tions pages are also no#n as The Yellow Pages   as that0s the $olor o the paper in the U, published ,auti$al !lmana$'1 SD - emi-diameter o the Moon' ne hal o the angular #idth o the Moon4 as obser+ed on earth' 1The Moon0s de$lination    $orre$tion' t0s the amount o de$lination the Moon $hanges per hour' *o#e+erthe amount to $orre$t the Moon0s de$lination using   is determined by the minutes and se$onds o time o the Moon0s obser+ation and is ound in the Increments and Corrections pages o The ,auti$al !lmana$' The   $orre$tion is algebraically added' !n easy #ay to determine #hether to add or subtract the  $orre$tion ound in the Increments and Corrections pages   is by e:amining the Moon0s de$lination trend in The ,auti$al !lmana$'  the de$linationis in$reasing (regardless o its sign ; or -) rom the integral hour o the obser+ation you made then add the   in$rement and in$rease the +alue o the de$lination'  the de$lination is de$reasing (regardless o itssign ; or -) rom the integral hour o the obser+ation you made then subtra$t the   in$rement andde$rease the +alue o the de$lination' Mae sure to put the sign <ba$ on= the $orre$ted de$lination soyou no# #hi$h hemisphere the Moon0s in'The n$rements and .orre$tions pages are also no#n as The Yellow Pages   as that0s the $olor o the paperin the U, published ,auti$al !lmana$'17 HP - the angle bet#een t#o lines4 one rom the $enter o the Moon to the $enter o the >arth4 the otherrom the $enter o the Moon to the edge o the >arth' This angle is about 704 but it $hanges slightly romday to day as the distan$e to the Moon $hanges along its ellipti$al path around the >arth' Source- starpath.com  16 Sun- E!n. of Time - >?uation o Time is the di@eren$e bet#een GMT/UT and A!, at Green#i$h' Thegures listed are or GMT/UT at %% h and 12 h '  you loo at Mer. Pass  just to the right o the E!n. of Time you0ll nd4 appro:imately4 #hen the un $rosses The rime Meridian (at Green#i$h)' The gures in the 12 h $olumn indi$ate4 appro:imately4 ho# many minutes and se$onds are subtra$ted4 or added4 to 12 todetermine #hen Ao$al !pparent ,oon is at The rime Meridian' Bou $an $al$ulate4 appro:imately4 #henA!, is at your Aongitude by adding4 or subtra$ting the amount o time di@eren$e bet#een you and
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