[DOC] [TLE] How do you measure the distance between Earth and the Sun ... [PAR] Jan 30, 2016 ... These two points indicate the greatest elongation of Venus and are the farthest ... 
One can also measure the angle between the Sun and Venus in the sky at the ... 
to use geometry to estimate the Earth-Sun distance was Aristarchus (c. ... 
Eratosthenes (276-194 BC), estimated the distance between Earth and... [DOC] [TLE] Astronomy 10: Lecture 4 - Center for Science Education [PAR] Monday, June 3rd 2002. ... Celestial Navigation: The Sky from different places on 
Earth ... His name was Aristarchus of Samos (circa 310 - 230 BC). ... Using the 
angular size of the Moon we can estimate its distance as well using ... 2 radians = 
360 ... and d ( ), it's the angular separation between the Sun and Moon in the sky
. [DOC] [TLE] Astronomy 101 Specials: Eratosthenes and the Size of the Earth [PAR] Eratosthenes' method for determining the size of the Earth was an elegant ... By 
using the difference in the elevation of the noontime sun at two different locations, 
... and the length of the shadow allowed him to calculate the angle between the... [DOC] [TLE] Eratosthenes' Calculation of Earth's Circumference [PAR] Jul 20, 2007 ... In 240 B.C., the Greek astronomer Eratosthenes made the first good 
measurement of the size of Earth. By noting the angles of shadows in two cities 
on the Summer ... right calculations using his knowledge of geometry and the 
distance ... overhead the Sun was in Alexandria by measuring the angle formed... [DOC] [TLE] Eratosthenes - Wikipedia [PAR] Eratosthenes of Cyrene was a Greek mathematician, geographer, poet, 
astronomer, and music ... The son of Aglaos, Eratosthenes was born in 276 BC in 
Cyrene. ... 240 BC, using knowledge of the angle of elevation of the Sun at noon 
on the ... Eratosthenes calculated the circumference of the Earth without leaving 
Egypt. [DOC] [TLE] The Geology P.A.G.E.: September 2011 [PAR] Sep 1, 2011 ... Eratosthenes calculated this c. 230 B.C. using the difference between the sun's 
angles at 2 places during June. [DOC] [TLE] Well, Well, Eratosthenes. - Lewiston Independent School District #1 [PAR] Before the Common Era (BC-E) in a city ... city with the duplicates, unknowingly ... 
with some of the greatest philoso- phers of his time. He arrived in Alexandria c. ... 
FIGURE 2. Alexandria. Alexandria If shadow angle at next solstice neared. ... a 
different sun angle in Alexandria from ... meter stick can also be used to calculate. [DOC] [TLE] Astronomical Unit: Prequel  three remarkable measurements ... [PAR] Jun 12, 2012 ... great measurements related to the earth, the moon, and the sun: ... should 
always expect an equal size of an object in different places. But that is not true 
and Eratosthenes realized the fact that during the summer solstice (June 20/21) 
... between two parallel lines always makes the same angle with each of... [DOC] [TLE] The Sources of Eratosthenes Measurement of the Earth [PAR] Later, when latitude was adopted, its values were often calculated from these ... 
Since the distance between the two places, which he thought were on the same 
... Four different statements about angles or arcs are involved in Eratosthenes' ... 
In using a gnomon, it is easy to make an error equal to the radius of the Sun, but 
a... [DOC] [TLE] History of astronomy - encyclopedia article - Citizendium [PAR] Oct 17, 2013 ... 2 Astronomy in ancient China; 3 Astronomy in ancient Mesopotamia ... 310 B.C. 
to 230 B.C.); 5.4 Eratosthenes of Cyrene (276 - 195 B.C.) ... circle of stones is 
aligned with the rising Sun on Midsummer's Day (June 21, ..... he was able to 
calculate geometrically the difference in zenith angle ... Aglaonike (c. [DOC] [TLE] Eratosthenes - Topics [PAR] The son of Aglaos, Eratosthenes was born in 276 BC in Cyrene. ... 240 BC, using 
knowledge of the angle of elevation of the Sun at noon on the summer ... 
Eratosthenes calculated the circumference of the Earth without leaving Egypt

Question: Eratosthenes calculated this c. 230 B.C. using the difference between the sun's angles at 2 places during June
Answer: the Earth\'s circumference