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You can set the ACL when you upload the file:
% aws put --public JohnGShaw/Codes/FastAstro/FastAstro-0.67.tgz FastAstro-0.67.tgz
(Note that --public and --set-acl=public-read are equivalent.)
If you want to manipulate the ACL for a file that is already uploaded, it's more difficult:
% aws get JohnGShaw/Codes/FastAstro/FastAstro-0.67.tgz FastAstro-0.67.tgz?acl acl.xml
(edit acl.xml)
% aws put JohnGShaw/Codes/FastAstro/FastAstro-0.67.tgz FastAstro-0.67.tgz?acl acl.xml
You have to download the ACL XML, modify it, and then set it again.