Session #3: more measuring :P
I tried...but I don't get the math
I understand that the little triangle equals the big triangle and that we can't physically measure the big triangle so we measure what we can, but I can't do the math and I feel frustrated(with the math).
I used the welding glass and I got the numbers and I have an equation,
which may or may not be correct:
on 9/26/06 at 5:00 CST in Chicago
l/d = L/D 40/3=13.333
l= distance from end of meter stick to viewer - 40cm
d= diameter of Sun in viewer - 3cm
L= 56,000,000 or 5.6
D= Distance of actual Sun - 1.4 km or 1,400,000cm(?)
56000000=40*1400000/3cm
my math doesn't work...
Sun Images
NASA/SOHO homepage
image from SOHO data:
Sept'05
7.08- diameter of image
7.5-diameter of whole image
0.944-sun image/whole image
0.52864- angle subtends
14.52785= distance to Sun
The math is getting me confused...help me read the data correctly
I did not understand the directions for creating the magnetic north-south line and measuring that angle.
maybe this will help me...
You'll need:
sundial template
a magnetic compass
card stock
elastic string with metal ends
atlas
What you do:Copy the sundial template onto card stock. Fold the tabs to an angle that corresponds to your latitude, as shown on an atlas. Then fold down both tabs to form the base of the sundial. Open your sundial to form a 90-degree angle and fold in the supporting tabs. To finish the dial, attach the elastic string through the holes at the top and bottom at the points where all the hour lines converge. This string is the gnomon (pronounced no-mun) and casts the shadow to indicate the time. To provide accurate time, the sundial (1) must be orientated with the gnomon pointing North/South; (2) must be located where a shadow will be cast by the gnomon most of the day. (Note: one can move the dial from window to window as the day progresses.) For greater accuracy, see the Equation of Time chart on the upper face of the sundial. A magnetic compass may be used to determine the North/South line. Because of the difference between magnetic North and true North, the sundial reading could be off by an hour or more. The variation will depend on the local difference between magnetic and true North.
What's going on?Your location on Earth in relation to the sun determines the time where you are. Because the Earth rotates as it travels round the sun, the date is also very important. Compare 5 o'clock in the afternoon in July with the same time in December. Your watch or clock measures standard time. Your sundial records solar time, which is not the same. According to solar time, noon is when the sun is directly overhead. Even though noon in Boston, New York and Miami happens at the same moment in standard time, there would be noticeable differences if you measured noon at all three locations in solar time.
Or maybe this site: At Home Astronomy
It was not sunny on Friday, I was sick on Saturday, and in class on Thursday, so I didn't complete that equinox activity.
I do not understand homework assignment #3 on the sun's shadow on another object.
The math is killing me.
I understand that the little triangle equals the big triangle and that we can't physically measure the big triangle so we measure what we can, but I can't do the math and I feel frustrated(with the math).
I used the welding glass and I got the numbers and I have an equation,
which may or may not be correct:
on 9/26/06 at 5:00 CST in Chicago
l/d = L/D 40/3=13.333
l= distance from end of meter stick to viewer - 40cm
d= diameter of Sun in viewer - 3cm
L= 56,000,000 or 5.6
D= Distance of actual Sun - 1.4 km or 1,400,000cm(?)
56000000=40*1400000/3cm
my math doesn't work...
Sun Images
NASA/SOHO homepage
image from SOHO data:
Sept'05
7.08- diameter of image
7.5-diameter of whole image
0.944-sun image/whole image
0.52864- angle subtends
14.52785= distance to Sun
The math is getting me confused...help me read the data correctly
I did not understand the directions for creating the magnetic north-south line and measuring that angle.
maybe this will help me...
You'll need:
sundial template
a magnetic compass
card stock
elastic string with metal ends
atlas
What you do:Copy the sundial template onto card stock. Fold the tabs to an angle that corresponds to your latitude, as shown on an atlas. Then fold down both tabs to form the base of the sundial. Open your sundial to form a 90-degree angle and fold in the supporting tabs. To finish the dial, attach the elastic string through the holes at the top and bottom at the points where all the hour lines converge. This string is the gnomon (pronounced no-mun) and casts the shadow to indicate the time. To provide accurate time, the sundial (1) must be orientated with the gnomon pointing North/South; (2) must be located where a shadow will be cast by the gnomon most of the day. (Note: one can move the dial from window to window as the day progresses.) For greater accuracy, see the Equation of Time chart on the upper face of the sundial. A magnetic compass may be used to determine the North/South line. Because of the difference between magnetic North and true North, the sundial reading could be off by an hour or more. The variation will depend on the local difference between magnetic and true North.
What's going on?Your location on Earth in relation to the sun determines the time where you are. Because the Earth rotates as it travels round the sun, the date is also very important. Compare 5 o'clock in the afternoon in July with the same time in December. Your watch or clock measures standard time. Your sundial records solar time, which is not the same. According to solar time, noon is when the sun is directly overhead. Even though noon in Boston, New York and Miami happens at the same moment in standard time, there would be noticeable differences if you measured noon at all three locations in solar time.
Or maybe this site: At Home Astronomy
It was not sunny on Friday, I was sick on Saturday, and in class on Thursday, so I didn't complete that equinox activity.
I do not understand homework assignment #3 on the sun's shadow on another object.
The math is killing me.
posted by Catherine at 3:29 PM
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