http://sunrise-sunset.org/api
> We offer a free API that provides sunset and sunrise times for a given latitude and longitude.
> Please note that attribution is required if you use our API. Check "Usage limits and attribution" section below for more information.
> The BNB Linked Data Platform provides access to the British National Bibliography published as linked open data and made available through SPARQL services. Two different interfaces are provided: a SPARQL editor, and /sparql a service endpoint for remote queries. Alternatively, use the search box below to enter a plain text term.
Added via my blog post https://shkspr.mobi/blog/2016/05/easy-apis-without-authentication/
Terence Eden