From: kutchScience
Dear Science and Astronomy friends,

Measuring Venus Elongation - If diagrams and attachement VENUSElongation.doc are
lost - will be Uploaded & links will be forwarded SOON.








As in Diagram 1: to measure upper and lower border timing of the Sun and mean
time for the centre of the sun.



Method 1) take two indexing poles A and B and fix it upright to one of wood
base. now observe the Sun (S) from the observation point (C) so as to come all
observation point C, upper end of A, and upper end of B and LOWER BORDER -
margin of Sun S - all in one line." -> C-> A-> B-> S " First observation -
record that time with a stopwatch facility so as to record 1/10 or 1/100 sec if
you have or in round seconds if you do not have stop watch.



Second observation - now take second reading when observation point C, upper end
of A, and upper end of B and UPPER Border of Sun S - all in one line." -> C->
A-> B-> S " so record the timing by stopping the stop watch when UPPER border
comes to same line position as above.



(Take those time difference of the two recorded readings. - ANY doubt - If you
have any doubt - you can take multiple readings as plenty of chances are there
in a day - also which will help to get you daily average timings to eradicate
all errors. It will take only few minutes).



Venus may be either North or South (depending on your position of the Earth and
the day you choose to experiment. Best chance is 20 March, as Sun is on
Equator). Else you need for measuring the angle of SUN to correct it.



That is the angles of planes of Venus and Earth’s orbit. You can measure that
angle by moving on the Arc N/S of the circle so as to keep same distance radius
of the arc and keeping one pole in line of Venus and than measure the angle
between two poles to see the plane of inclination. That will be the tilt of
orbital of Venus with the Earth’s orbit. Best chance is 20 March, as Sun is on
Equator. Else you need for measuring the angle of SUN to correct it.



Third observation – As Diagram 2: As sun near sets and Venus is clearly visible
measure Venus timing to come at same angle of the Sun, (in about 3 hours time)
calculate the diff of mean time for the centre of the Sun and Venus.



now take reading when observation point C, upper end of A, and upper end of B
and Venus - all in one line." -> C-> A-> B-> V " so record the timing by
stopping the stop watch when UPPER border comes to same line position as above.



Advanced Method 2) : Same readings can be recorded on VIDEO recording and on
theodolite stand, grid screen lines and clock running while recording. so you
can measure all direction and Axis and in one go without waiting Venus to come
in line. just change of angle and measure. and many video has shutter sped of
10,000 and can be played in slow frame - by frame, you can re run by reply. no
need to take multiple reading in this method. Also this has in built clock
running in the screen 1/100 or 1/1000 of the second can be recorded to most
accurate readings.





Dr.BHUDIA-Science Group Of INDIA.
http://uk.groups.yahoo.com/group/venustransit_2004/
President:"Kutch Science Foundation".
Founder :"Kutch Amateurs Astronomers Club - Bhuj - Kutch".
Life Member:"kutch Itihaas Parishad".
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