Post on 15-Jul-2015
HELIOCENTRIC vsGEOCENTRIC Systems
#frame of reference
A P R E S E N TATIO N B Y – PAWAN R AM A M AL I
Ancient Observations
Geocentric Theory
Heliocentric Theory
Apparent motion of Marsagainst "fixed" stars
5
1
2
3
4
56
7
12
3
4
5
67
Earth
Mars
*
*
***
*
January
July
Retrograde Motion of Planets
Planets sometimes appear to loop back -retrograde motion
Loops are called "epicycles"
Frame of reference
• Required for performing survey operations.
• Also known as control points or stations
• These points are determined with respect to certain
coordinate systems.
• Defined by its axes and origin .
P (x, y)
X
Y
x
y
O
(X, Y, Z) P
O
X
Y
Z
Y
X
Z
Coordinate System
Geocentric frame of reference
Greenwich Meridian
Equator
Earth Surface
X
Y
Z
(X, Y, Z)
XY
Z
Geocentric frame of reference
Greenwich Meridian
Equator
Earth Surface
X
Y
Z
P
h
),,( h
Celestial frame of reference
Horizontal coordinate system
Equatorial coordinate system
Equatorial coordinate system
Ecliptic coordinate system
Heliocentric ecliptic coordinates
Galactic coordinate system
Galactic coordinate system
Super-galactic coordinate system
CELESTIA
Thank You
THE E N D