EarthCoin is a new generation scrypt coin that is a descendant of Litecoin.
Like Litecoin - it uses scrypt as a proof of work scheme.

EarthCoin uses a 365 day period. It will start with 10,000 coins per block, 
and it varies in a sine curve with amplitude of 2,000, with a period of 
one year (like the Earth moving around the Sun). 

This means that you start with 10,000 coins, and it adjusts at each block,
 reaches a maximum of 12,000 coins per block after about 3 months, then
 it will descend gradually to approx 10,000 coins per block again at about
 6 months. Then a new minimum of 8000 coins per block at about 9 months. 

Then we reverse that - to climb and return to 10,000 coins per block at 
one year, before finally cutting the payout in half.

http://papaj703.blogspot.com/2013/12/earthcoin-information-and-faucet.html