The Nautical Almanac 2018

1 Downloaded : These are computer generated tables from a program written by Enno Rodegerdts. Use at 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. For security relevant applications you should buy an official version of the Nautical Nautical Almanac 2018 The Nautical AlmanacTable of ContentsPartPageCalendar, yearly3 Day of Week & Day Number of Year4-5 Links Time signals Bowditch Terrestrial Almanac Pub. No. 249 Pub. No. 229 Sight Reduction Forms and Methods6 Formulas7-9 Explanation of The Nautical Almanac pages10-13 Moon Phases (includes Moon in graphic form)14-15 Conversion of Arc to Time16 Note!

2 Monthly Almanac page numbers are found at the bottom of each pageJanuary2 February22 March42 April62 May82 June102 July122 August144 September164 October184 November204 December224 Note! Increments and Corrections are found on the pdf page numbers below Tables of Increments and Corrections for Sun, planets, Aries, Moon ( the yellow pages )261 Navigational Star Chart281fair winds, clear skies & following 2018 are free to copy and distribute this document in its entiretyfreely ye received, freely give2018 Table of Contents- regular of Week & Day of Year2018123456 JanuaryFebruaryMarchAprilMayJuneDayDayDa yDayDayDayDayDayDayDayDayDayDayofofofofo fofofofofofofofofMonthWeekYearWeekYearWe ekYearWeekYearWeekYearWeekYear1 Mon1 Thu32 Thu60 Sun91 Tue121 Fri1522 Tue2 Fri33 Fri61 Mon92 Wed122 Sat1533 Wed3 Sat34 Sat62 Tue93 Thu123 Sun1544 Thu4 Sun35 Sun63 Wed94 Fri124 Mon1555 Fri5 Mon36 Mon64 Thu95 Sat125 Tue1566 Sat6 Tue37 Tue65 Fri96 Sun126 Wed1577 Sun7 Wed38 Wed66 Sat97 Mon127 Thu1588 Mon8 Thu39 Thu67 Sun98 Tue128 Fri1599 Tue9 Fri40 Fri68 Mon99 Wed129 Sat16010 Wed10 Sat41 Sat69 Tue100 Thu130 Sun16111 Thu11 Sun42 Sun70 Wed101 Fri131 Mon16212 Fri12 Mon43 Mon71 Thu102 Sat132 Tue16313 Sat13 Tue44 Tue72 Fri103 Sun133 Wed16414 Sun14 Wed45 Wed73 Sat104

3 Mon134 Thu16515 Mon15 Thu46 Thu74 Sun105 Tue135 Fri16616 Tue16 Fri47 Fri75 Mon106 Wed136 Sat16717 Wed17 Sat48 Sat76 Tue107 Thu137 Sun16818 Thu18 Sun49 Sun77 Wed108 Fri138 Mon16919 Fri19 Mon50 Mon78 Thu109 Sat139 Tue17020 Sat20 Tue51 Tue79 Fri110 Sun140 Wed17121 Sun21 Wed52 Wed80 Sat111 Mon141 Thu17222 Mon22 Thu53 Thu81 Sun112 Tue142 Fri17323 Tue23 Fri54 Fri82 Mon113 Wed143 Sat17424 Wed24 Sat55 Sat83 Tue114 Thu144 Sun17525 Thu25 Sun56 Sun84 Wed115 Fri145 Mon17626 Fri26 Mon57 Mon85 Thu116 Sat146 Tue17727 Sat27 Tue58 Tue86 Fri117 Sun147 Wed17828 Sun28 Wed59 Wed87 Sat118 Mon148 Thu17929 Mon29 ThuThu88 Sun119 Tue149 Fri18030 Tue30 Fri89 Mon120 Wed150 Sat18131 Wed31 Sat90 Thu151 Day of Week & Day of Year2018789101112 JulyAugustSeptemberOctoberNovemberDecemb erDayDayDayDayDayDayDayDayDayDayDayDayDa yofofofofofofofofofofofofofMonthWeekYear WeekYearWeekYearWeekYearWeekYearWeekYear 1 Sun182 Wed213 Sat244 Mon274 Thu305 Sat3352 Mon183 Thu214 Sun245 Tue275 Fri306 Sun3363 Tue184 Fri215 Mon246 Wed276 Sat307 Mon3374 Wed185 Sat216 Tue247 Thu277 Sun308 Tue3385 Thu186 Sun217 Wed248 Fri278 Mon309 Wed3396 Fri187 Mon218 Thu249 Sat279 Tue310 Thu3407 Sat188 Tue219 Fri250 Sun280 Wed311 Fri3418 Sun189 Wed220 Sat251 Mon281 Thu312 Sat3429 Mon190 Thu221 Sun252 Tue282 Fri313 Sun34310 Tue191 Fri222 Mon253 Wed283 Sat314 Mon34411 Wed192 Sat223 Tue254 Thu284 Sun315 Tue34512 Thu193 Sun224 Wed255 Fri285 Mon316 Wed34613 Fri194 Mon225 Thu256 Sat286 Tue317 Thu34714 Sat195 Tue226 Fri257 Sun287 Wed318

4 Fri34815 Sun196 Wed227 Sat258 Mon288 Thu319 Sat34916 Mon197 Thu228 Sun259 Tue289 Fri320 Sun35017 Tue198 Fri229 Mon260 Wed290 Sat321 Mon35118 Wed199 Sat230 Tue261 Thu291 Sun322 Tue35219 Thu200 Sun231 Wed262 Fri292 Mon323 Wed35320 Fri201 Mon232 Thu263 Sat293 Tue324 Thu35421 Sat202 Tue233 Fri264 Sun294 Wed325 Fri35522 Sun203 Wed234 Sat265 Mon295 Thu326 Sat35623 Mon204 Thu235 Sun266 Tue296 Fri327 Sun35724 Tue205 Fri236 Mon267 Wed297 Sat328 Mon35825 Wed206 Sat237 Tue268 Thu298 Sun329 Tue35926 Thu207 Sun238 Wed269 Fri299 Mon330 Wed36027 Fri208 Mon239 Thu270 Sat300 Tue331 Thu36128 Sat209 Tue240 Fri271 Sun301 Wed332 Fri36229 Sun210 Wed241 Sat272 Mon302 Thu333 Sat36330 Mon211 Thu242 Sun273 Tue303 Fri334 Sun36431 Tue212 Fri243 Wed304 Mon365 Useful InformationTime Signals- by telephoneWWV 303-499-7111 WWVH 808-335-4363 CHU English: 613-745-1576 (CHU provides only Eastern time announcements)French: 613-745-9426 Time signals- by RadioWWV (Fort Collins, Colorado) , 5, 10, 15, 20 MHz (male voice)WWVH ( Kauai, Hawaii) , 5, 10, 15 MHz (female voice)CHU (Ottawa, Canada) 3330, 7850, and 14,670 kHz (USB)Bowditch2017- The American Practical Navigator in a convenient and useful manner.

5 Download the Chapters, Parts or Tables you want or the entire Terrestrial Almanac Annual calendar and day planner for the entire No. 249 Download individual Latitudes or No. No. 229 Download individual Volumes covering a range of No. Reduction Forms & Signals and Navigation useful FormulasAbout CalculatorsThe 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. Entering degrees, minutes and seconds isvery simple. The casio fx-300ES Plus has 9 memory locations and you can review many of theprevious entries you make using a special key on the Hc using a calculatorThe formulaHc = asin[sin(Declination)*sin(Latitude) + cos(Latitude)*cos(Declination)*cos(LHA)] As it would be entered into the casio calculator Note- Sin-1 is the arc-sin keySin-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 observing.)

6 When the heavenly body's declination is Contrary name to your Ap Latitude enter a negative sign before is the Latitude where you are, think you are or where you would like to determine Hc , you'll be using an Assumed position Latitude or Ap Latitude as it's Western LongitudesLHA is the Local Hour Angle which is derived from subtracting your whole number value ofLongitude (Assumed or otherwise) from the whole number value of GHA (Greenwich Hour Angle).In Eastern LongitudesLHA, in Eastern Longitudes, is determined by rounding up the GHA fgure to the next highestwhole degree fgure then adding the DR. Longitude to GHA to obtain LHA. Only add the wholedegree DR. Longitude fgure to the rounded up whole degree GHA fgure. If the resulting LHAfgure is greater than 6r0n then subtract 6r0n from the fgure to obtain the would you want to determine Hc using a calculator?

7 It's faster than looking up in Pub. No. 249 and Pub. No. 229, highly accurate and you don't need alot of printed out pages of Latitudes from Pub. No. 249 and Pub. No. 229. Pub. No. 249 Vol. 2 & 6don't cover any declination greater than 29 degrees so you'd have to use Pub. No. 229 which isextremely NavigationDetermine ZZ = acos[(sin(Declination) sin(Ap Latitude) x sin(Hc)) (cos(Ap Latitude) x cos(Hc))]As it would be entered into the casio Note- Cos-1 is the arc-cosine keyCos-1((Sin(Declination) Sin(AP Latitude) x Sin(Hc)) (Cos(AP Latitude) x Cos(Hc)If the heavenly body's declination is Contrary name to the Ap Latitude enter a negative sign before obtain Zn see the rules below for Northern and Southern Z independent of Hc L is latitude and d is declination.))

8 When the heavenly body's declination is Contrary name to your Ap Latitude enter a negative sign before it would be entered into the casio Note- tan-1 is the arc-tangent keyZ = tan-1 ((sin (LHA) (cos(AP latitude) x tan(declination) (sin(AP latitude) x cos(LHA))The sign convention used in the calculation of this azimuth formula is as follows: from Bowditch Chapter 22 CALCULATIONS AND CONVERSIONS, page 3311) If latitude and declination are of contrary name, declination is treated as a negative quantity;2) If the local hour angle is greater than 180n , it is treated as a negative quantity. If the azimuth angle as calculated is negative, add 180n to obtain the desired value. To obtain Zn apply the following rules In Northern Latitudes LHA greater than 180n.)

9 Zn=Z LHA less than 180n ..Zn=6r0n ZIn Southern Latitudes LHA greater than 180n ..Zn= 180n Z LHA less than 180n ..Zn= 180n + ZDetermine Tan of (Ha)Determine Dip using x (Square Root of He (Height of Eye) in feet)Determine Dip using x (Square Root of He (Height of eye) in meters )Rules to Calculate Latitude using the Sun- Noon-Sight 1- Latitude and declination Same name but latitude is greater than declination:Latitude= (90n Ho) + declination2- Latitude and declination Same name but declination greater than latitude:Latitude= Declination (90n Ho)3- Latitude and declination Contrary name:Latitude= (90no Ho) DeclinationTo get AP longitude (needed for plotting the LOP)In Western longitudesCombine the DR Longitude fgure with only the minutes (of arc) of the total GHA fgure.

10 The Ap fgure will be used when plotting the LOP on the Eastern longitudesIn Eastern longitudes the Ap is determined as follows;DR longitude + (0n r0n' minus GHA minutes of arc)Example- E 075 + (0 60' 0 02')= 75 58' Ap longitudefair skies and following Sheet added to of The Nautical Almanac Daily Pages 1 Date based on GMT/UT2 Time based on GMT/UT (this is just integral hour only)3 Mer. pass- meridian passage of Aries at the Prime Meridian- Greenwich- 0 . Time figure is v correction and Declination d correction. The amount to correct v and d for is determined by theminutes and seconds of time of the planet observation and is found in the Increments and Correctionspages of The Nautical Almanac . The Increments and Corrections pages are also known as The YellowPages as that's the color of the paper in the USNO published Nautical is the magnitude or brightness of the planet.