From: KutchScience

To: bhujkutch ; bhuj ; kachchh ; kutchastronomersclub ;
kutchscience2 ; kutchsciencefoundation ; madhapar ;
scienceclubofindia ; kutchScience ; venustransit2004 ;
spacepeople@yahoogroups ; venustransit@yahoogroups.com ;
astronomyclubindia ; kutchastronomyclub@yahoogroups.com Vigyan
Prasar ; space-india.org@delhi
Sent: Friday, June 11, 2004 1:09 PM

Dear Science and astronomy Friends,

http://in.groups.yahoo.com/group/scienceclubofindia/files/MeasureEarth
.doc

http://in.groups.yahoo.com/group/scienceclubofindia/lists/

Hints: as Calculation of AU with the help of Venus transit we need to
measure Earth First in reality rather than just taking it granted. As
on the summer solstice day The sun is on the 23.5 N, we need to go
there and find actual place on 23.5 on the day at local time 12:00
NOON. And that will be real practical aspect rather than just taken
granted Last discussion time.

June 2004) : Measuring the Earth:

Sub: How long will it take and how far we need to go to measure the
Earth? Similar to the experiment below, But all need to do is use
local time. When sun comes overhead (No east or No West). And select
two place A & B of Maximum possible distance apart NORTH and SOUTH
and do the measurement same time at both place as follows.

We can use one control place "S" in South or "N" in North about 50 Km
away to correct any minor errors from short distance "few KM"
experiment.

Similar Example of Latitudes longitude finding at the Local time. –
for tropical of cancer @ Local time you need to find the correct time
when sun is on the head with no shadows East or West. and need to be
there at LOCAL time of 12:00 NOON which may be 12 + MM depending on
the place where you go – Longitudes.

Experiments done at the Place A & B (NEAR 23.5 N) on 12 Noon IST will
have shadow towards East/West. Depending your positions in India
(West/ East of 82.5 E Longitude). And so accordingly you will get
shadow East/West. Measure the length of that of shadow of 3 Meter
pole OR a PLUM LINE shadow and find the Tangent = shadow/ pole - will
give u the angle. Say example : shadow = 600 mm at that time. So
600/3000= 0.2

so anti tangent is an angle of 11.30' degree. so you are 11..30'
West/East of IST line means IF shadow is East than you are WEST and
at 82.30' - 11.30' = 71 degree East longitude.

(If shadow is in the EAST than - you are IN the East of the TIME LINE
so you need to Start an experiment a DAY BEFORE (20 JUNE) and
repeated on 21st JUNE before 2 hours before 12 IST and preferably to
start more than an hour before to set up all arrangements)

Now you find exact time when to take results of the experiment. when
there is no shadow to the EAST/WEST - at 12Noon + (11.3o' x4) = @12 +
46 PM Here you have 46 minutes to do that. To take the next accurate
place readings. When there is no shadow in East/West but to the
NORTH/SOUTH ONLY (depending your position North or south of the SUN
in India or in the world) at that place at that time. GPS may be in
correct to show that but not the SUN.

Now measure the length of the shadow in accuracy of mm fractions. @
places "A", "B" & "N" or "S"@ the same time. If the Difference of the
length of shadow is 1mm at places "A" and "B" same time at Local time
when sun comes over head –(NO shadow on East or West) the
calculations will be simplified as follows. Anti tan 1/3000 gives the
angle made by shadow on the Earth surface gives the angle = at the
centre of the Earth by the distance of the place "A"to "B" on the
surface of the EARTH. Eg about 1.145' (1+') and find the
Circumference of the Earth = 360 degree. (around 40000 Km)

Similarly Controlled reading at "N" / "S" will help you to find
accuracy eg long distance measure will give more accuracy than 2KM
and correct your readings from that 50 KM distance experiments. (that
will give you about 23.5 mm shadow Difference than that of "A" and
23.5+1 mm than that of "B") so calculate the anti tangent and angle
and circumference of the Earth and Diameter or R for the Earth.

TO SIMPLIFY MORE and Easy work, Let One of the "N" OR "S" be Either
Delhi Jantar Mantar or JAIPUR - JANTAR MANTAR.

We are very rich in our Astronomy engineering - particularly JAIPUR
is the Richest in that sense. Jaipur has very good working
observatory (VEDH SHALA) with guiding facility.

According to an expert guide (who are also expert in astronomical
calculations)- And that all works local timing and longitude -
latitude of the place. Only the persons required to work for it.

We should utilize that place with aided observation with Summer
solstice of 21 June 2004. TEAM A - working with Local observatory
guides and Team B working with at the 23.5 N. That is the best place
for us to utilize the observation at that place and that is relay an
opportunity for Jaipur & Delhi and users too.

(Delhi and Jaipur observatory – Vedh Shala are constructed such a way
that it can work locally @ that Longitude Latitude and also at a
LOCAL time of that place. So we do not need to find the place
location of Longitude-Latitude while working there nor the local
time of that working place (Auto Sun Dial activity) – nor we need
toys like GPS nor sophisticated instruments. Not only that but many
of such astronomical activities – One like coming VENUS TRANSIT on 8
June 2004 also needs to be observed and activity to be worked in same
environment such as Local time and longitude Latitude, so many of
planetarium places and activity are just nothing in comparisons to
such VITAL places as others has to use their toys of GPS and
telescopic compass and Leveling like a Theodolites). So if we use
this place on the day 21 June2004 for a Solistic measurements. (use
the real measured distance from 23.5N to Vedh shala NS distance
measured by vehicle travel)

World geometric dimension Table: created

Earth's Equatorial Diameter
Equatorial Circumference 2D
Earth's Inter Polar Diameter
Inter Polar Circumference 2D

12756 Km (E to W)
40053 KM (E to W)
12714 K m (N to S)
39900 KM (N to S)

(E to W 23:30 N/S)
(Using Tangent 23:30=0.917)


360 degree @ 23.5 Degree
36730km@Tropic of Cancer 360 deg Round the Earth
39900 KM Inter Polar

1 Degree = 60 ` Mins /360
=102 km = 64 Miles
1 Degree = 60 ` Mins /360
=110 km = 70 Miles

1' Min = 60 " Secs /60
=1.7 KM =1.067 Miles
1' Min = 60 " Secs /60
=1.84 KM =1.16 Miles

=1700 M = 5632 Feet

=1840 M = 6124 Feet

1"Sec /60
28.3 M =94 Feet
1"Sec /60
30.8 M =102 Feet

= 37 adult steps
= 18 Second's walk
= 40 adult steps
= 20 Second's walk


1minute walk =300feets=92M

1minute walk =300feets=92M

1hour = 5.4 Km walk

1hour = 5.4 Km walk

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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