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A60283 The principles of astronomy and navigation, or, A clear, short, yet full explanation of all circles of the celestial and terrestrial globes and of their uses : being the whole doctrine of the sphere and hypotheses to the phenomena of the primum mobile : to which is added a discovery of the secrets of nature which are found in the mercurial-weather-glass &c. : as also a new proposal for buoying of a ship of any burden from the bottom of the sea / by George Sinclair. Sinclair, George, d. 1696.; Sinclair, George, d. 1696. Proteus bound with chains, or, A discovery of the secrets of nature which are found in the mercurial-weather-glass. 1688 (1688) Wing S3857; ESTC R26242 48,104 164

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and Nations This Political Year is manifold for it is either Iulian which contains 365 days hours 6 which six Hours if they were reckoned every Year would make confusion therefore the Masters of Astronomy have appointed they should be omitted till the fourth Year and then four times six make 24 which make up a full and compleat Day which being inter caled that is interlaced or put between as in Leap Year there is a Day put between the 28 of February and the first of March the Year is called Annus Intercalaris or Bissextile Year It is to be adverted that the cause of correcting the Iulian Calendar by Pope Gregory the 13 in the year 1582 was the unjust quantity of it For by this it came to pass that after some Ages the four Cardinal Points did anticipate and prevent their Seats and so at length the four Seasons of the Year might be interchanged From this it is evident this Day that according to these times the Equinoctial and the Ingress of the Sun into the 12 Signs have anticipated almost 13 Degrees That is the entering of the Sun into Aries Taurus c. falleth out sooner by 13 Degrees than to the Romans which comes to pass because more than what is just is given to the space of the Year For there were given to the Year by the correction of Iulius Cesar 365 days and six hours for which hours every fourth year one day is added and so the common Iulian year contains 365 days but the Bissextile 366. But seing the Solar year in which the Sun runs thorow the whole Ecliptick is less than this space by almost eleven Minuts of Time every Year it comes to pass that in 50 year and a half one hour remains and in the space of 130 years a whole day remains I said the Political Year was manifold either Iulian of which hitherto or Egyptian or Iudaical The Egyptian year contains always 365 days This Year was esteemed most useful by the antient Astronomers for the Art of reckoning the Celestial Motions The Iudaical Year is accommodated and fitted to the Motion of the Moon and contains for the greatest part twelve and sometimes thirteen Lunations This Year did the Astronomers use before the reformation of the Calendar instituted by Iulius Cesar by the help of one Sosigenes a famous and learned Mathematician The beginning of these Years is divers also For the antient Romans began their Year from March the later Romans from the midst of Winter called Bruma The Iews by Divine Institution began their Year from the New Moon which was next after to the Vernal Equinox That we this day begin our Year from the first of Ianuary it is for this because we following the custom of the late Romans beginning their Year from the midst of Winter which was nearest to the first of Ianuary by little and little the Winter Solstice did prevent and anticipat its Seat and Place The Egyptian year hath not a sure beginning by reason that six hours are omitted Hence is it that every fourth Year it anticipats one Day and therefore within 365 Years four times numbered or 1460 Iulian Years the beginning of the Egyptian Year wanders over all the Days of the Iulian Year CHAP. XIV Concerning the divers Phenomena which are to be seen in the various Positions of the Sphere THe last part of this little Tractat shall be in examining the Phenomena which are proper to the various Situations and Positions of the Sphere The Sphere may have seven different Positions 1. When both the Poles of the World do rest in the Horizon which is called a Right Sphere The second Position is Oblique when our Vertical Point is terminated between the Equinoctial and either of the Tropicks The third Position is when our Zenith is under either of the Tropicks The fourth is when our Zenith is between either of the Tropicks and the neighbouring Polar The fifth is when our Zenith is in the very Polar itself The sixth is when our Zenith is between either of the Polars and the neighbouring Pole of the World. And lastly when the Poles of the World do fall in with the Poles of the Horizon which is called a Parallel Sphere CHAP. XV. Concerning the Phenomena of the first Position 1. EVery Star in the Heavens riseth and setteth neither is there one of them without this property and therefore in this Position there is neither Polar Artick nor Antartick according to the Antients 2. There is here a perpetual Equinox 3. The Sun every Year passing twice over their Heads is to them twice Vertical to wit when he is in the Equinoctial Points 4. As much as the Sun declines from their Vertical Point towards the North as much also doth he decline from their Vertical Point towards the South 5. They have four Solstices two when the Sun is highest in their Vertical Point and two when he is lowest in Cancer and Capricorn 6. They have two Summers and two Winters but only Analogically for even in Winter their Bodies are scorched with heat 7. There are here in this Position five different Shadows the Meridional or South Shadow the North Shadow a Shadow from the East a Shadow from the West and a perpendicular Shadow which falls out only when the Sun is in the Equinoctial Points 8. The end or extremity of their Gnomons upon their Horizontal Dialls which are our Polar Dialls describe the whole Year the Figure called Hyperbole except when the Sun is in the beginning of Aries and Libra where he describes a straight and right Line CHAP. XVI Of the Phenomena of the second Position 1. SOme Northern Stars tarrying always above our Horizon have Eternal Days and contrariwise there are some about the South Pole which never come above the Horizon but have Eternal Nights 2. The Artick and Antartick Circles according to the Antients are not as yet equal to our Polars 3. The Artificial Day is not equal to its own Night two Days only excepted when the Sun is in the Equinoctial Points at which time there is thorow the whole World an Equinox 4. The longest Day there doth not exceed thirteen Hours and a half 5. The Sun is to them twice Vertical every Year to wit when he comes to those Degrees of the Ecliptick whose Declination is equal to the Latitude of the Place for he describes then a Parallel thorow the Zenith 6. The Sun in the Meridian goeth further towards the South than towards the North. Note That we are now speaking and in the following Discourse of those seven Positions which are in the Northern Sphere 7. There are here four Solstices two high and two low The two highest fall out when the Sun is in that Parallel which passeth thorow the Zenith The two lowest are when the Sun is in the Tropicks Yet that which falls out in the Tropick of Capricorn is lower than that which falls out in the Tropick of Cancer 8. They have two Summers