Start a hangout

## Profile

Hari Subramanian

54 followers|5,242 views

AboutPostsPhotosVideos

## Stream

### Hari Subramanian

Shared publicly -What is a definition of beginning of New Year? Here is one thought by ancient Tamils. The year for earth begins when it enters Aries. That is today 13th April 2012. HAPPY NEW YEAR TO ALL.

Actually, calendar for earth is thought of as division of time in terms of years (year is the duration of one orbital movement by earth around the sun to reach the First Point of Aries again). One year is again subdivided into 12 months. Tamil calendar does it in this manner. The orbit of earth around sun is not exactly a circle, but an ellipse, and the sun is at one focus of this ellipse. From this focus, imagine 12 radial lines to the orbit with the first radial line to the First Point of Aries and other radial lines conceived in order to divide the 12 consecutive wedge areas so formed to have equal areas. The time taken by earth to move on the arc portion of each wedge is a MONTH. The elliptical nature of the orbit gives different durations of these months. Each month is now divided into number of days corresponding to the number of self-revolutions of earth about its axis. Accordingly, a day is taken to be the duration of time taken by earth to complete one such self-revolution. Thus, a month has approximately 30 days, but not exactly. This is visually explained by noting that the arcs of 12 wedges explained earlier are not of equal length.

In fact, the so called First Point of Aries is itself not fixed rigidly in the universe. The 12 wedges are imagined to give 12 zodiacal starting points. This explains that a particular Tamil year does not start at sun rise or at noon or at midnight (which are practically useful points of reference). Similarly, a particular month also does not start at sun rise etc. According to Tamil panchangam calculations, the current new year (named Nandana) starts at about 5.45PM (IST) on 13th April 2012.

Actually, calendar for earth is thought of as division of time in terms of years (year is the duration of one orbital movement by earth around the sun to reach the First Point of Aries again). One year is again subdivided into 12 months. Tamil calendar does it in this manner. The orbit of earth around sun is not exactly a circle, but an ellipse, and the sun is at one focus of this ellipse. From this focus, imagine 12 radial lines to the orbit with the first radial line to the First Point of Aries and other radial lines conceived in order to divide the 12 consecutive wedge areas so formed to have equal areas. The time taken by earth to move on the arc portion of each wedge is a MONTH. The elliptical nature of the orbit gives different durations of these months. Each month is now divided into number of days corresponding to the number of self-revolutions of earth about its axis. Accordingly, a day is taken to be the duration of time taken by earth to complete one such self-revolution. Thus, a month has approximately 30 days, but not exactly. This is visually explained by noting that the arcs of 12 wedges explained earlier are not of equal length.

In fact, the so called First Point of Aries is itself not fixed rigidly in the universe. The 12 wedges are imagined to give 12 zodiacal starting points. This explains that a particular Tamil year does not start at sun rise or at noon or at midnight (which are practically useful points of reference). Similarly, a particular month also does not start at sun rise etc. According to Tamil panchangam calculations, the current new year (named Nandana) starts at about 5.45PM (IST) on 13th April 2012.

1

2

5 comments

Happy Tamil New Year Anna and Manni.... nice article. thank you.

Add a comment...

In his circles

60 people

### Hari Subramanian

Shared publicly -Here is a thought about Jnana margam and Bakthi margam. Ganeshar andSubramaniar seem to project thes..

1

Add a comment...

### Hari Subramanian

Shared publicly -MATHEMATICS • GEOMETRY

———————————————————————

———————————————————————

———————————————————————

**Which Figure is drawn by the top of this stick ?**———————————————————————

1

ellipse

Add a comment...

People

In his circles

60 people

Links

YouTube

Basic Information

Gender

Male