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York University
Natural Science
NATS 1745
Robin Metcalfe

What celestial event is Newgrange aligned to? Describe what happens at Newgrange on this day · Newgrange’s roof box is aligned to the winter solstice sunrise. Abeam of sunlight hits the roof-box and illuminates the floor, which will eventually illuminate the main chamber. · As sun rises, a light of beam through roof-box Describe what happens to the Sundagger on the solstices and equinoxes. · At the winter and summer solstice, and rise also at the equinoxes, sunlight shines between three giant rocks at the summit of Fajada Butte, throwing bright “sundaggers” onto an intricate set of spiral patterns carved on the rock behind What celestial event is Stonehenge aligned to? Describe what happens at Stonehenge on this day. · Stonehenge is most likely an observatory for following the sun through the seasons. It is a monumental shrine to the sun. Stonehenge’s heel stone is aligned to the summer solstice sunrise. The sun rises just over the heel stone position of the monument on the summer solstice. Why do archeoastronomers suspect that Stonehenge's Heel Stone had a missing partner stone? · The sun used to hit right next to the Heel Stone and that didn’t make sense · Also it was the only stone that was by itself when all other stones in the Stonehenge were in pairs What causes the Sun to rise and set every day? · Due to Earth’s 24 hour eastward spin around its polar axis, the sun moves westward across the sky; it rises in the east, reaches its highest point at noon, then sets in the west. . What is the local time for an observer who is directly facing the opposite side of the sky from Sun? local midnight local time when the sun is at its highest point in the sky? local noon What is the local time when the Sun is seen on the Eastern horizon? local sunrise What is the local time when the Sun is seen on the Western horizon? Local sunset What is the azimuth of the noon Sun in the northern hemisphere? How about the southern hemisphere? · Northern Hemisphere its due south. · Southern Hemisphere its due north. · *The reason being is because the sun's daily arc in the Northern Hemisphere is shifted towards the south. The noon sun means that the sun is at its highest point in the sky and it also means our location is directly facing the sun's direction.That's why its due south. "Due" meaning exact. · Apply that same concept to the Southern Hemisphere. The sun's daily arc is shifted towards the North. Once again, the noon sun is at its highest point in the sky and it also means the southern hemisphere's location is directly facing the sun's direction.That explain's due north for them What does the word "solstice" mean? How does it describe what happens to the Sun's rising and setting positions on the solstices? · The word means solar stand still · The sun itself never stands still but what we are referring to by the stand still is the rising and the setting position · The sun rises at different location on the sky everyday · When it stops shifting south the stoppage of the shifting What is the azimuth of sunrise and sunset on the Northern winter solstice? How about the Northern summer solstice? How about the equinoxes? · for the winter solstice, NE and summer solstice, its SE · winter solstice: SE, SW. summer solstice: NE, NW. equinox: E, W Describe how the Thirteen Towers of Chankillo, Peru were used to track the time of year. Given that this site is in the southern hemisphere, what is the approximate azimuth (NE, SE, NW, SW) of the winter solstice marker? How about the summer solstice marker? · On the midwinter solstice, the Sun rises behind the leftmost tower of the 13 that makes up the newly discovered solar observatory of Chankillo in Peru. During the next 6 months, it rises behind all the others in turn. In the S- hemisphere, the Sun’s daily arc point N- rather than S. · Remember, dealing with South, which means Winter Solstice Sun is rising NE and Sun setting NW. one of them will be t NE . Sunrise -> points NE. Sunset -> points NW · SE, and SW marked by furthest tower. Which day is the longest day of the year, and why? Which day is the shortest day of the year, and why? What are the lengths of daytime and nighttime on the equinoxes? · Longest day of the year is the Summer Solstice · It's because the sun travels its highest, longest arc which means it’ll be at its highest point in the sky and it'll spend the most amount of time above its horizon compared to other daily arcs th
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