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_________________________ yeLatitude12011110293847566574839210111120 _________  degrs   min  degrs   min  degrs   min  degrs   min  degrs   min  degrs   min under ye pole degrs   min  degrs   min  degrs   min  degrs   min  degrs   min  degrs   min _________ A Table ofthe North StarsHourly Altitudefrom ye Meridian:Being Abovethe Pole to theHour of :6: & thenunder ye Poleto the Hour of 12:The North StarsDestination being87=36degs   min_________________________ 602=242=192=03:1=39·1=08:0=32:0=05·0=42·1=16·1=452=08:2=202=24_________ 532=242=192=041=401=100=340=040=411=141=442=07:2=202=24_________ 502=242=192=041=401=100=340=040=411=14·1=43:2=062=202=24_________ 402=242=192=041=401=100=350=030=401=141=432=05·2=19·2=24_________ 302=242=19·2=04:1=411=110=35:0=020=391=13·1=43.2=052=192=24_________ 202=242=192=041=411=110=360=010=381=131=422=052=19·2=24_________ 102=242=192=051=411=120=370=00:0=37:1=121=422=052=192=24_________ 02=242=192=051=42.1=120=37:0=000=37:1=121=422=052=192=24_________ Latitude degrs   min  degsr   min  degsr   min  degrs   min  degrs   min  degrs   min under ye pole degrs   min  degrs   min  degrs   min  degrs   min  degrs   min  degrs   min _________ A Table ofthe North StarsHourly Azimuthfrom ye NorthAt Every Hourfrom ye Meridian:Eather Before orAffter: in degrs& MinThe Declinationbeing    87=36from ye Equinoctiallto :60:degr of Latitude North_________________________ 60Northabovethe pole0=001=20·2=35.·3=34:4=18:4=434=48.·4=334=00:3=142=15:1=10·0=00Northunderye   pole0=00 530=001=052=062=56·3=333=543=593=483=212=431=540=590=00_________ 500=001=011=572=44·3=193=393=433=333=09:2=331=470=550=00_________ 400=000=511=372=162=463=033=083=002=402=101=310=470=00_________ 300=000=44·1=25·2=00·2=26·2=42·2=46··2=40·2=22·1=56·1=21:0=42·0=00_________ 200=000=40:1=18·1=50·2=14·2=292=332=27:2=12·1=471=16·0=39·0=00_________ 100=000=38:1=14·1=442=072=21:2=26·2=21·2=06·01=431=13·0=380=00_________ 00=000=37·1=121=42·1=120=37:0=000=37:1=121=42·1=170=370=00_________ Latitude degrs   min  degrs   min  degrs   min  degrs   min  degrs   min  degrs   min under ye pole degrs   min  degrs   min  degrs   min  degrs   min  degrs   min  degrs   min 

Sir

Haveing spent somme time In Calculating the Sun & fixed Stars Hourly Altitude & Azimuth: I have heare in this Small Table shewed the Hourly Altitude & Azimuth of the North Star for Every Hour from ye Meridian in degrs & Min whose declination being suppoased to be in theese our times – 87degrees=36minutes: by wch Declination I have Calculated theese tables wch I suppoase may hold good Especially in the Altitude wch is Above Or Below the pole for Every Hour wch is for Every Tenth Latitude from 60: To the Equinoctiall / And as for the Azimuth I have heare in Like manner shewede it in deg & min Being counted from ye North / But this way of Azimuth is Calculated without haveing any Respect at All to ye Altitude and by such a duble way of workeing in such an Eaysey way manner that it may be supposed to be moore dubius but seemeingly very plauseable so yt the product of one Simple Multiplycation being Added & Substacted {illeg}|T|o or from a Nother given sum & Likewise the halfe of the product given wch so done sheweth the Hourly Azimuth for :6: Hours vizd for 10 or 2 before the North Meridian {illeg} And 10 Or 2 before the South Meridian & Likewise for ye Hour of 6: And likewise the Rest of the Other Hours in ye same manner by a doble way of workeing: As suppose yt the North Stars Comes to ye Meridian at ye Hour of 12: at midnight & I would Have ye Azimuth at 10 at night and 2 in the Morning and 10 in ye morning and 2 in the Affter Noon & Likewise 6 in the Morning & :6: at night these Six hours of the North Star Or the Sunn Or Any Other Stars Azimuth is found \in/ the like Manner But for Any Other Hour as suppoase 9 in ye at night & 3 in ye Morning & 5|9| in the Morning and 3 in the Affernoon wch foure hours ar wrought by the product of one simple Multiplication wch is by onley Adding it to Or Substacting it from a Nother Summ given: so yt the 24 Hours Azimuth is Resol found by the product of 5 sumss of multiplication: by Addition & {Substraction}: wch maketh mee som{illeg}|e|thing to dout of the Exactness theareof: therefore I would desire you if time will permit to Examine the Table for the truth thereof wch if it hold Good; I suppose that there cannot well be a More Eaysey & E{illeg} way of Callculation of Hourly Azimuth I have in many places Not onely sett doune the degree & minute of the Azimuth but I have likewise pr{illeg}|i|cked by the Minutes Sum Small prickes Every prick being {illeg}|1| quarter of a minute wch if it be before ye min it is less if after more: for I might as well sett downe ye ser as the minutes wch was as dearley shewed in the Calculation but being needless I did omit it: therfore I would desire you to Examine ye Table & give me Notice of the truth thereof as soone as may be for I shall wery shortley Be for Mary Land: hoping to be at London by the Latter End of this Month or the beginning of the Next Sept: Hav\e/ing no moore at prsent I Remaine at your Command to serve you.

Arthur Storer

Boothby Aug: 10th 1678.

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If I should be at London before you wright you may direct your Letter To Mr William Kings Junior Silke weaver in three horshoo Alley in Old Street:

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For Mr Isaac Newton of Trinr {sic} Coll
In Cambridg
{prs}

© 2024 The Newton Project

Professor Rob Iliffe
Director, AHRC Newton Papers Project

Scott Mandelbrote,
Fellow & Perne librarian, Peterhouse, Cambridge

Faculty of History, George Street, Oxford, OX1 2RL - newtonproject@history.ox.ac.uk

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