Eratosthenes Determines the Size of the Earth in about 200 B.C.
... The direction where the Earth’s poles point isn’t always the same – the Earth is wobbling like a top. Why? Due to the gravitational pull of the Sun and the Moon on the non-spherical Earth. The Earth has an equatorial bulge – It is a little fatter across the equator than around the poles. (Diameter d ...
... The direction where the Earth’s poles point isn’t always the same – the Earth is wobbling like a top. Why? Due to the gravitational pull of the Sun and the Moon on the non-spherical Earth. The Earth has an equatorial bulge – It is a little fatter across the equator than around the poles. (Diameter d ...
Lab Activity on Variations in the Apparent Daily Path of
... one Solar Motion model per person (You may keep them!) Introduction to the Model Celestial Sphere: In this activity, you will use a celestial globe, which is a model of the celestial sphere just as a world globe is a model of the Earth. The stars are shown as white dots on a clear plastic sphere. Th ...
... one Solar Motion model per person (You may keep them!) Introduction to the Model Celestial Sphere: In this activity, you will use a celestial globe, which is a model of the celestial sphere just as a world globe is a model of the Earth. The stars are shown as white dots on a clear plastic sphere. Th ...
Kaler`s MEASURING THE SKY
... rotation pole, given by lower case Greek letter Phi) of 45°, halfway between the Earth's equator and the north pole. The latitude of the north pole is 90°, that of the equator 0°. The Earth appears to lie at the center of a fictional celestial sphere. You pretend that you are inside the sphere at th ...
... rotation pole, given by lower case Greek letter Phi) of 45°, halfway between the Earth's equator and the north pole. The latitude of the north pole is 90°, that of the equator 0°. The Earth appears to lie at the center of a fictional celestial sphere. You pretend that you are inside the sphere at th ...
A105 Stars and Galaxies
... depend on latitude and time of year? They depend on latitude because your position on Earth determines which constellations remain below the horizon. They depend on time of year because Earth’s orbit changes the apparent location of the Sun among the stars. ...
... depend on latitude and time of year? They depend on latitude because your position on Earth determines which constellations remain below the horizon. They depend on time of year because Earth’s orbit changes the apparent location of the Sun among the stars. ...
Naked-eye astronomy
... • However it is still a model that remains a useful tool of positional astronomy • Landmarks on the celestial sphere are projections of those on the Earth ...
... • However it is still a model that remains a useful tool of positional astronomy • Landmarks on the celestial sphere are projections of those on the Earth ...
Astronomy 15 - Homework 3 - Due Wed. April 24 1) As we`ll see
... axis and the luminosity on the vertical axis. For historical reasons, the temperture is shown increasing to the left – the hottest stars are on the left-hand side of the diagram. Many variants of the diagram exist in which the quantities plotted are not strictly the surface temperature and the lumin ...
... axis and the luminosity on the vertical axis. For historical reasons, the temperture is shown increasing to the left – the hottest stars are on the left-hand side of the diagram. Many variants of the diagram exist in which the quantities plotted are not strictly the surface temperature and the lumin ...
Lecture 2 ppt - Physics 1025 Introductory Astronomy
... – Analogous to latitude, but on the celestial sphere; it is the angular north-south distance between the celestial equator and a location on the celestial sphere. – Measured in degrees: » 0 ° to 90 ° – north from celestial equator » 0 ° to -90 ° – south from celestial equator ...
... – Analogous to latitude, but on the celestial sphere; it is the angular north-south distance between the celestial equator and a location on the celestial sphere. – Measured in degrees: » 0 ° to 90 ° – north from celestial equator » 0 ° to -90 ° – south from celestial equator ...
The Celestial Sphere
... 1. Prepare the two star charts by cutting along the outside lines with the scissors. The star chart will look like a black flower with eight petals. The white line that crosses four of the petals is the ECLIPTIC. This line represents the apparent path of the Sun against the stars due to the motion o ...
... 1. Prepare the two star charts by cutting along the outside lines with the scissors. The star chart will look like a black flower with eight petals. The white line that crosses four of the petals is the ECLIPTIC. This line represents the apparent path of the Sun against the stars due to the motion o ...
Document
... alignment of the Sun, Earth, and Moon. • Phases go through ~1 cycle every moon-th, er, month. • The Moon also rotates once in exactly the same time, so the same side always faces Earth all the time. • We see the part that is facing us that is also lit up by the Sun. The “dark” part is NOT a result o ...
... alignment of the Sun, Earth, and Moon. • Phases go through ~1 cycle every moon-th, er, month. • The Moon also rotates once in exactly the same time, so the same side always faces Earth all the time. • We see the part that is facing us that is also lit up by the Sun. The “dark” part is NOT a result o ...
Chapter 02
... As a result of precession, the celestial north pole follows a circular pattern on the sky, once every 26,000 years. We are lucky to live at a time when a fairly bright star (Polaris, magnitude 2) is near the north celestial pole. It will be closest to Polaris ~ A.D. 2100. ...
... As a result of precession, the celestial north pole follows a circular pattern on the sky, once every 26,000 years. We are lucky to live at a time when a fairly bright star (Polaris, magnitude 2) is near the north celestial pole. It will be closest to Polaris ~ A.D. 2100. ...
Announcements
... PRS QUESTION: Suppose that the tilt of the Earth’s axis of rotation were 90 degrees instead of 23.5 degrees, and the North Pole faces the Sun in June. HOW MANY HOURS OF SUNLIGHT ...
... PRS QUESTION: Suppose that the tilt of the Earth’s axis of rotation were 90 degrees instead of 23.5 degrees, and the North Pole faces the Sun in June. HOW MANY HOURS OF SUNLIGHT ...
LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
... 11. Describe the Equatorial coordinate system to fix the position of body in the celestial sphere. 12. Find the condition that twilight may last through out night. 13. Derive cassini’s formula for refraction, indicating the assumptions made. 14. If the moon’s horizontal parallax is 57’ and her angul ...
... 11. Describe the Equatorial coordinate system to fix the position of body in the celestial sphere. 12. Find the condition that twilight may last through out night. 13. Derive cassini’s formula for refraction, indicating the assumptions made. 14. If the moon’s horizontal parallax is 57’ and her angul ...
Definitions
... – 88 recognized groups named after characters from classical mythology and various common animals and objects. ...
... – 88 recognized groups named after characters from classical mythology and various common animals and objects. ...
Stars, Constellations, and the Celestial Sphere
... 3. The inclination of Earth’s equator to its orbit varies between 22º and 24º with a period of 41,000 years. Ice ages occur with a period of about 250 million years. Within any given ice age, cycles of glaciation occur with a period of about 40,000 years. Oceanographic evidence shows ocean temperatu ...
... 3. The inclination of Earth’s equator to its orbit varies between 22º and 24º with a period of 41,000 years. Ice ages occur with a period of about 250 million years. Within any given ice age, cycles of glaciation occur with a period of about 40,000 years. Oceanographic evidence shows ocean temperatu ...
Answer - OKBU.net
... • Is celestial equator always perpendicular to earth's axis & the north celestial pole? __yes • What is the altitude of the celestial equator on the meridian as seen from Shawnee? _55 • From a constant terrestrial latitude will the value for the previous answer change? _no • Is the angle between the ...
... • Is celestial equator always perpendicular to earth's axis & the north celestial pole? __yes • What is the altitude of the celestial equator on the meridian as seen from Shawnee? _55 • From a constant terrestrial latitude will the value for the previous answer change? _no • Is the angle between the ...
Astronomy Assignment #1
... 6. How does the Sun move with respect to the stars during the day? ...during the year? 7. Why does everyone have 12 hours of daylight on the equinoxes? 8. Why is the length of daylight in the northern hemisphere so short on December 21? 9. When will the Sun be at its highest altitude in the year in ...
... 6. How does the Sun move with respect to the stars during the day? ...during the year? 7. Why does everyone have 12 hours of daylight on the equinoxes? 8. Why is the length of daylight in the northern hemisphere so short on December 21? 9. When will the Sun be at its highest altitude in the year in ...
Stars, Constellations, and the Celestial Sphere
... The horizon for an observer at O is the intersection of a plane tangent to Earth at O with the celestial sphere. Everything that the observer can see is above the tangent plane (represented by the green line in the figure). The angle between the celestial equator (yellow line) and the horizon (gree ...
... The horizon for an observer at O is the intersection of a plane tangent to Earth at O with the celestial sphere. Everything that the observer can see is above the tangent plane (represented by the green line in the figure). The angle between the celestial equator (yellow line) and the horizon (gree ...
Sun - Midlandstech
... Guidepost (continued) Answering those questions will tell you a great deal about yourself and your home on planet Earth. Three additional questions will tell you more about how ...
... Guidepost (continued) Answering those questions will tell you a great deal about yourself and your home on planet Earth. Three additional questions will tell you more about how ...
Planetarium Lab 1
... • Is celestial equator always perpendicular to earth's axis & the north celestial pole? __yes • What is the altitude of the celestial equator on the meridian as seen from Shawnee? _35 • From a constant terrestrial latitude will the value for the previous answer change? _no • Is the angle between the ...
... • Is celestial equator always perpendicular to earth's axis & the north celestial pole? __yes • What is the altitude of the celestial equator on the meridian as seen from Shawnee? _35 • From a constant terrestrial latitude will the value for the previous answer change? _no • Is the angle between the ...
Lab 2
... 12. Draw the location of the Sun as accurately as possible on figure 3. 13. Two students are discussing their answers to the question “Figure 4 shows the same view of the sky one month later on January 1. Draw the location of the Sun as accurately as possible on figure 4.” Student 1 (Davey): The Sun ...
... 12. Draw the location of the Sun as accurately as possible on figure 3. 13. Two students are discussing their answers to the question “Figure 4 shows the same view of the sky one month later on January 1. Draw the location of the Sun as accurately as possible on figure 4.” Student 1 (Davey): The Sun ...
The Milky Way - Computer Science Technology
... Outline (continued) V. Astronomical Influences on Earth's Climate A. The Hypothesis B. The Evidence ...
... Outline (continued) V. Astronomical Influences on Earth's Climate A. The Hypothesis B. The Evidence ...
Chapter 2 User`s Guide to the Sky
... Outline (continued) V. Astronomical Influences on Earth's Climate A. The Hypothesis B. The Evidence ...
... Outline (continued) V. Astronomical Influences on Earth's Climate A. The Hypothesis B. The Evidence ...
Armillary sphere
An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (in the celestial sphere), consisting of a spherical framework of rings, centred on Earth or the Sun, that represent lines of celestial longitude and latitude and other astronomically important features such as the ecliptic. As such, it differs from a celestial globe, which is a smooth sphere whose principal purpose is to map the constellations.With the Earth as center, an armillary sphere is known as Ptolemaic. With the sun as center, it is known as Copernican.