Add night checking and clean up Makefile

main.go

@@ -11,6 +11,7 @@ import (
 	"strconv"
 	"sync"
 	"time"
+	"github.com/nathan-osman/go-sunrise"
 
 	_ "modernc.org/sqlite"
 	"gocv.io/x/gocv"
@@ -41,6 +42,12 @@ var (
 	lock sync.Mutex
 )
 
+func isNight(lat, lon float64) bool {
+	now := time.Now()
+	sunriseTime, sunsetTime := sunrise.SunriseSunset(lat, lon, now.Year(), now.Month(), now.Day())
+        return now.Before(sunriseTime) || now.After(sunsetTime)
+}
+
 func main() {
 	initDB()
 	go backgroundCollector()
@@ -108,14 +115,22 @@ func estimateCloudCover(url string) (float64, error) {
 }
 
 func backgroundCollector() {
+	lat, lon := 44.3897, -68.8040 // your location (New York example)
 	for {
 		cover, err := estimateCloudCover(imageURL)
 		result := CloudResult{Timestamp: time.Now(), CloudCover: cover}
 		if err != nil {
 			result.Error = err.Error()
 		}
-		storeResult(result)
-		fmt.Printf("[%s] Cloud cover: %.2f%%\n", result.Timestamp.Format("15:04:05"), result.CloudCover)
+
+
+                //lat, lon := 40.7128, -74.0060 // your location (New York example)
+	        if !isNight(lat, lon) {
+		    storeResult(result)
+		    fmt.Printf("[%s] Cloud cover: %.2f%%\n", result.Timestamp.Format("15:04:05"), result.CloudCover)
+                } else {
+	            fmt.Println("🌙 It's night — skipping cloud capture")
+		}
 		time.Sleep(time.Duration(refreshSecs) * time.Second)
 	}
 }