gnu: Add go-github-com-nathan-osman-go-sunrise.

* gnu/packages/golang.scm (go-github-com-nathan-osman-go-sunrise): New
variable.

Signed-off-by: Christopher Baines <mail@cbaines.net>

gnu/packages/golang.scm

@@ -2485,6 +2485,32 @@ web framework
 @end itemize")
     (license license:expat)))
 
+(define-public go-github-com-nathan-osman-go-sunrise
+  (let ((commit "c8f9f1eb869135f07378e7e3c5ec7a005f806c73")
+        (revision "0"))
+    (package
+      (name "go-github-com-nathan-osman-go-sunrise")
+      (version (git-version "1.1.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/nathan-osman/go-sunrise")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32
+           "017zwzx05r5spxcs07dp6bnh7waknzsd819k7aqd8kr819v3x9in"))))
+      (build-system go-build-system)
+      (arguments
+       (list #:import-path "github.com/nathan-osman/go-sunrise"))
+      (home-page "https://github.com/nathan-osman/go-sunrise")
+      (synopsis "Calculate sunrise and sunset times in Go")
+      (description
+       "This package provides a Go library for calculating sunrise and
+sunset times from geographical coordinates and a date.")
+      (license license:expat))))
+
 (define-public go-github-com-aws-sdk
   (package
     (name "go-github-com-aws-sdk")