right ascension
Post on 22-Jul-2015
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VINAYA RANSING
TIME ZONE
IS DIVIDED INTO 360 DEGREE
GMT ST
ST LMT
MAP OF INDIA WITH STD LONGITUDE
The Earth rotates more than 360° per day. However, we define our 24 hour "day" relative to the Sun, not relative to the Earth's actual rotation. If we didn't do this, then "Noon" would occur a little later each day until "Noon" was happening at night!
SIDEREAL TIME
SUNRISE- SUNSET
Calculated by declination of the heavenly body and
corresponding latitude of the place on earth.
SAYAN RAVI - AND W
AXIS PRECESION
CELESTIAL SPHERE
Right Ascension and Declination are a system of
coordinates used in astronomy to determine the
location of stars, planets and other objects in the
night sky. They are similar to the system of
longitude and latitude used to locate places on
Earth.
LATTITUDES LONGITUDES
SAME AS
DECLINATION AND RIGHT ASCENSION.
STARTING FROM VERNAL EQUINOX
RA MEASURED IN H M S
HOW TO CALCULATE
DECLINATION –
DRAW A LINE FROM NCP TO THE OBJECT AND
EXTEND TILL IT MEET CELESTIAL EQUATOR.
RA –
From point on c e to vernal equinox
Once we find the declination, next we have to find
Ascentional Difference AD in H M S.
The distance of the place from equator and the
declination of the Sun.
- Declination is always measured + and - from the
Celestial Equator
Definition of Ascensional Difference The difference
between the Right Ascension of any body and its
Oblique Ascension: used chiefly as expressing the
difference in time between the rising or setting of a
celestial body, and six o'clock; or, six hours from the
meridianal passage. To find this, add the log. tangent of
the declination of the planet, to the log. tangent of the
latitude of the place. The sum will be the log. sine of the
Ascensional Difference.
MERIDIAN
The semi-circle above the line between these
points represents the visible heavens. Bisecting this
line generates the meridians. The Upper Meridian is
known as the Medium Coeli (MC) - the zenith of the
heavens
ASCENDANT
The longitudes of celestial sphere at eastern zenith
The ascendant ( or As), or rising sign, is the
zodiacal sign and degree that was ascending on
the eastern horizon at the specific time and
location of an event.
RAMC
RIGHT ASCENSIONAL MERIDIAN COLLEI
It is mid heaven. Location in the celestial sphere. Zenith
Zenith refers to an imaginary point directly "above"
a particular location, on the imaginary celestial
sphere
.
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