Science Birthdays, March 15

Today is the birthday of Johann Loschmidt, born in 1821; he called himself Josef which was his middle name.  He wrote a book in 1861 with over 300 two-dimensional representations of molecules, Chemische studien.  He represented benzene with a circle four years before Kekule. He was the first to estimate the size of air molecules and propose a constant for measuring the number of gas molecules in a volume called the Loschmidt constant.  He also proposed the Loschmidt paradox while working with his friend Ludwig Boltzman.  I wonder how many people have ever heard of him, this is some pretty important stuff.

Nicolas Lacaille was also born on this day in 1713, an astronomer, originally studied theology, directed an expedition to the Cape of Good Hope to measure the moon’s parallax. He prepared a star map of the southern sky, discovered Alpha Centauri to be a double star and named the southern stars after astronomical instruments. He lived in poverty but gave away copies of his star maps to anyone who wanted one, he died in 1762 at the age of 49.

Advertisements

Leave a comment

Filed under Scientist's Birthdays, Uncategorized

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s