To find out how much brown sugar is left in the canister after Jerry measured out 0.9 grams, we can subtract the amount used from the original amount.
Starting amount of brown sugar: 465 grams
Amount used: 0.9 grams
Now, subtract the amount used from the starting amount:
\[ 465 , \text{grams} - 0.9 , \text{grams} = 464.1 , \text{grams} \]
Thus, the amount of brown sugar left in the canister is 464.1 grams.