Superb Moon

All of us heard about the recent super moon phenomenon that took place on March 19 2011. Yes, I too witnessed the event late in the might and here is one of my pic.

Solving Sudoku - tactics

Sudoku, the puzzle of this decade,  is quite a fun to solve.!
But if you find it boring and think it is fun only as long as one can solve it.. then do take my word..

"Sudoku is lot more fun to solve when it gets harder, but only if you have the right tactics and solving strategies."

Over the next few weeks we will discuss solving tactics of varying levels and difficulties starting from the easiest to the difficult ones. We will only discuss the tactics for 3x3 sudoku ppuzzle..But before we start on that, I have a few points to make:

Calculate the day of any date

Do you want to know How to calculate the day of any given date off hand?

Then read on..

For any given date, there is a simple workable formula to calculate the corresponding day. Since for most of the times we would work with dates in 20th and 21st century, So let me just limit myself to explain a simple formula that would work for these 200 years!

Naming the days of the week

How are Days of the week named?

Continuing with the last post of why there are 7 days in a week, here I will try to elucidate the idea behind the naming and the order of the days in a week. This was the method used in the olden times (Babylonian civilization) to arrive at the names for the days and their order.

7 days in a week

Many civilizations and religions have the concept of 7 days making a week. Is there any astronomical significance for this (7 days in a week)? How come all civilizations chose exactly to have 7 days in a week?

I had asked the very same question to Dr.S.Balachandra Rao of the Gandhi Center at the M.P.Birla Research Foundation. (Some of you might know him as the mathematics professor & HOD and former principal of National College).

He is an exponent in the subject of calendars and has authored many books. Link to all his books (both math and astronomy) is provided here.

Age of the universe

How do they calculate the age of the universe

Hubble constant (Ho) is used to estimate the age of the universe..

How Do They Do It..

This is how...