diff --git a/.changeset/witty-wombats-doubt.md b/.changeset/witty-wombats-doubt.md
new file mode 100644
index 0000000..a9b5f10
--- /dev/null
+++ b/.changeset/witty-wombats-doubt.md
@@ -0,0 +1,5 @@
+---
+"@watergis/maplibre-gl-sky": patch
+---
+
+fix: improved algorithm to get the correct time's sky definition. update sky when move map if location is not specified.
diff --git a/packages/maplibre-gl-sky/README.md b/packages/maplibre-gl-sky/README.md
index b18c19a..20dd891 100644
--- a/packages/maplibre-gl-sky/README.md
+++ b/packages/maplibre-gl-sky/README.md
@@ -21,14 +21,14 @@ import { SkyControl } from '@watergis/maplibre-gl-sky';
 const map = new Map();
 
 const sky = new SkyControl();
-sky.addToMap(map);
+sky.addTo(map);
 ```
 
 - add specific sky color
 
 ```ts
 const sky = new SkyControl();
-sky.addToMap(map, {
+sky.addTo(map, {
 	timeType: 'sunset'
 });
 ```
@@ -37,7 +37,7 @@ sky.addToMap(map, {
 
 ```ts
 const sky = new SkyControl();
-sky.addToMap(map, {
+sky.addTo(map, {
 	date: new Date()
 });
 ```
@@ -51,7 +51,7 @@ const newOptions = defaultSkyOptions;
 // edit your options for `newOptions`
 
 const sky = new SkyControl(newOptions);
-sky.addToMap(map);
+sky.addTo(map);
 ```
 
 ## License
diff --git a/packages/maplibre-gl-sky/index.html b/packages/maplibre-gl-sky/index.html
index f3697c3..71b1712 100644
--- a/packages/maplibre-gl-sky/index.html
+++ b/packages/maplibre-gl-sky/index.html
@@ -40,7 +40,7 @@
 		>
 		<div id="map"></div>
 		<div id="overlay">
-			<p id="time-buttons" class="buttons"></p>
+			<p id="time-buttons" class="buttons has-addons"></p>
 		</div>
 		<script type="module" src="./index.ts"></script>
 	</body>
diff --git a/packages/maplibre-gl-sky/index.ts b/packages/maplibre-gl-sky/index.ts
index 69a1046..5cb4249 100644
--- a/packages/maplibre-gl-sky/index.ts
+++ b/packages/maplibre-gl-sky/index.ts
@@ -65,6 +65,9 @@ const map = new Map({
 map.addControl(new NavigationControl({ visualizePitch: true }), 'top-right');
 map.addControl(new maplibregl.AttributionControl({ compact: false }), 'bottom-right');
 
+const sky = new SkyControl();
+sky.addTo(map);
+
 const timeButtons = document.getElementById('time-buttons');
 
 const autoBtn = document.createElement('button');
diff --git a/packages/maplibre-gl-sky/src/lib/SkyControl.ts b/packages/maplibre-gl-sky/src/lib/SkyControl.ts
index b8da644..5eb20f5 100644
--- a/packages/maplibre-gl-sky/src/lib/SkyControl.ts
+++ b/packages/maplibre-gl-sky/src/lib/SkyControl.ts
@@ -1,8 +1,10 @@
 import { Map, SkySpecification } from 'maplibre-gl';
 import SunCalc from 'suncalc';
-import { AddToOptions, AvailableTimeTypes, Options, SkyTimeType } from './interfaces';
-import { defaultSkyOptions } from './defaultOptions';
+import { AddToOptions, AvailableTimeTypes, Options, SkyTimeType, TimeType } from './interfaces';
+import { defaultSkyOptions } from './constants';
 import dayjs from 'dayjs';
+import utc from 'dayjs/plugin/utc';
+dayjs.extend(utc);
 
 export class SkyControl {
 	private map?: Map;
@@ -29,10 +31,14 @@ export class SkyControl {
 				this.map?.setSky(currentSky);
 			});
 		}
-	}
 
-	private timeToSec(date: dayjs.Dayjs) {
-		return date.hour() * 60 * 60 + date.minute() * 60 + date.second();
+		if (!options?.location) {
+			this.map.on('moveend', () => {
+				const currentSky = this.getSky(options);
+				if (!currentSky) return;
+				this.map?.setSky(currentSky);
+			});
+		}
 	}
 
 	private getSky(options?: AddToOptions) {
@@ -62,24 +68,40 @@ export class SkyControl {
 	private getSkySpecByTime(lng: number, lat: number, date?: Date) {
 		const skyOptions = this.options.skyOptions;
 		if (!skyOptions) return;
+		// convert to UTC
+		let currentDate: dayjs.Dayjs;
 		if (!date) {
-			date = new Date();
+			currentDate = dayjs.utc();
+		} else {
+			currentDate = dayjs(date).utc();
 		}
-		const times = SunCalc.getTimes(date, lng, lat);
+		const times = SunCalc.getTimes(currentDate.toDate(), lat, lng);
 
-		const currentDate = dayjs(date);
-		const currentTimeSec = this.timeToSec(currentDate);
+		// add 1 day before and 1 day after
+		const timesBefore: { type: TimeType; date: dayjs.Dayjs }[] = [];
+		const timesToday: { type: TimeType; date: dayjs.Dayjs }[] = [];
+		const timesAfter: { type: TimeType; date: dayjs.Dayjs }[] = [];
+		AvailableTimeTypes.forEach((timeType) => {
+			const targetTime = dayjs(times[timeType]).utc();
+			timesToday.push({ type: timeType, date: targetTime });
+			const before = targetTime.add(-1, 'day');
+			timesBefore.push({ type: timeType, date: before });
+
+			const after = targetTime.add(1, 'day');
+			timesAfter.push({ type: timeType, date: after });
+		});
+		let availableTImes = [...timesBefore, ...timesToday, ...timesAfter];
+		availableTImes = availableTImes.sort(
+			(a, b) => a.date.toDate().getTime() - b.date.toDate().getTime()
+		);
 
 		let beforeTime: SkyTimeType = {};
 		let afterTime: SkyTimeType = {};
 
-		AvailableTimeTypes.forEach((timeType) => {
-			let targetTime = dayjs(times[timeType]);
-			let targetTimeSec = this.timeToSec(targetTime);
-			if (targetTime.isSame(currentDate, 'day') && targetTimeSec < currentTimeSec) {
-				targetTime = targetTime.add(-1, 'day');
-				targetTimeSec = this.timeToSec(targetTime);
-			}
+		availableTImes.forEach((time) => {
+			const targetTime = time.date;
+			const timeType = time.type;
+			// console.log(timeType, targetTime.toISOString(), currentDate.toISOString())
 
 			if (targetTime.isBefore(currentDate)) {
 				const sky = skyOptions[timeType] as SkySpecification;
@@ -117,11 +139,28 @@ export class SkyControl {
 
 		// console.log(beforeTime, afterTime);
 
-		const activeTime = afterTime?.sky ?? beforeTime?.sky;
-		if (activeTime) {
-			return activeTime as SkySpecification;
+		const beforeDiff = beforeTime.date
+			? currentDate.toDate().getTime() - beforeTime.date.toDate().getTime()
+			: -1;
+		const afterDiff = afterTime.date
+			? afterTime.date.toDate().getTime() - currentDate.toDate().getTime()
+			: -1;
+
+		let activeTime: SkySpecification;
+		if (beforeDiff > -1 && afterDiff > -1) {
+			if (afterDiff > beforeDiff) {
+				activeTime = afterTime.sky as SkySpecification;
+			} else {
+				activeTime = beforeTime.sky as SkySpecification;
+			}
+		} else if (beforeTime && !afterTime) {
+			activeTime = beforeTime.sky as SkySpecification;
+		} else if (afterTime && !beforeTime) {
+			activeTime = afterTime.sky as SkySpecification;
 		} else {
-			return skyOptions.solarNoon;
+			activeTime = skyOptions.solarNoon;
 		}
+
+		return activeTime;
 	}
 }
diff --git a/packages/maplibre-gl-sky/src/lib/defaultOptions.ts b/packages/maplibre-gl-sky/src/lib/constants/defaultOptions.ts
similarity index 98%
rename from packages/maplibre-gl-sky/src/lib/defaultOptions.ts
rename to packages/maplibre-gl-sky/src/lib/constants/defaultOptions.ts
index 513652e..23dc1d5 100644
--- a/packages/maplibre-gl-sky/src/lib/defaultOptions.ts
+++ b/packages/maplibre-gl-sky/src/lib/constants/defaultOptions.ts
@@ -1,4 +1,4 @@
-import { Options } from './interfaces';
+import { Options } from '../interfaces';
 
 export const defaultSkyOptions: Options = {
 	skyOptions: {
diff --git a/packages/maplibre-gl-sky/src/lib/constants/index.ts b/packages/maplibre-gl-sky/src/lib/constants/index.ts
new file mode 100644
index 0000000..3c2bf3c
--- /dev/null
+++ b/packages/maplibre-gl-sky/src/lib/constants/index.ts
@@ -0,0 +1 @@
+export * from './defaultOptions';
diff --git a/packages/maplibre-gl-sky/src/lib/index.ts b/packages/maplibre-gl-sky/src/lib/index.ts
index ed77ab8..edabd73 100644
--- a/packages/maplibre-gl-sky/src/lib/index.ts
+++ b/packages/maplibre-gl-sky/src/lib/index.ts
@@ -1,2 +1,3 @@
 export * from './SkyControl';
 export * from './interfaces';
+export * from './constants';