REFERENCECIRCLES ECLIPTIC CIRCIE: This is the deilp se o the earth going arvand

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REFERENCECIRCLES ECLIPTIC CIRCIE: This is the deilp se o the earth going arvand the sanj throagh the llanm as the band of animals or Zdiac. The Planets and owr Moon are also are found in de on tr aling this path. The ECLIPTIC is indicated by a dashed The dash panh on the dial) and list four comstellations tbat ir goes ehrowgh The mames shou es Les Celestial FOUATOR: Since the sky appears as a great sphere above us we can use a great circle to divide h up jast like we do the earth. The carth has poles since it rotates hence we divide the earth in balt with the Equator. Since the sky rotates it also has polest Celestial poles. the brass pin is the North Celestial Pole or NCP for short) and we can imagine a great cirele called the Celestial EQUATOR that divides the celestial sphere in halr Find the Celestial EQUATOR indicated by a drawn solid circle and name four constellations that it goes C: Celestial REFERENCE POINTS: EQUINON experiences equal day and nights(i.e. all parts of the earth have 12 hrs day and 12 hrs night) known as the in tewe places Examine both cireles and find both points. These points are the position that the Sun takes when the earth Equinoxes. What two constellations is the Sun in when it reaches theses points? Remember: Sun moves in Zodiac! SOLSTICE: When the sun reaches the point on its path (ecliptic) that is furthest from the equator we reach a point called a solstice. There are two points that this happens. One above the equator the other below. The constellation the sun is in when it is furthest below(LOCATOR is held with NORTH up!) the equator This is the first day of Winter and is known as the WINTER SOLSTICE: The SUMMER SOLSTICE is the point furthest above the equator and the sun is the constellation? SPRING and FALL Equinox a thinking exercise! Turn the dial till you see one of the intersections of the Ecliptic path and Celestial Equator. Since the sun advances on the ecliptic day by day clockwise (Right to Left on your dial). This latter motion is opposite the daily counter rotation of the sky. Since the sun is below the equator for winter then the situation implies that the first day of Spring known as the SPRING OR VERNAL EQUINOX occurs when the sun is in the constellation? Hence the FALL or AUTUMNAL EQUINOX the first day of autumn occurs when the sun is in constellation? HINT: The Sun goes from below the equator to above the equator.! The Sun is dropping below the equator As an aside; the ancient civilization which started the Zodiac thought the sun traveled the circle called the ecliptic fully around in 360 days.. Thus, we divide to this day, circles up into 360 degrees. Actually a year is days and we can say the sun approximately travels on the ecliptic MOTION SUMMARY: Facing the Star Finder with the North Horizon Up the sky rotates in counter clockwise manner. The stars will make a complete rotation in 24 hrs due to the carths rotation (hence, hourly marks on the Solar System Laboratory Manual Page 7

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