diff --git a/src/hooks/useCodapData.ts b/src/hooks/useCodapData.ts
index 2da1a73..ec26549 100644
--- a/src/hooks/useCodapData.ts
+++ b/src/hooks/useCodapData.ts
@@ -42,8 +42,7 @@ export const useCodapData = () => {
     const calcOptions: DaylightCalcOptions = {
       latitude: Number(latitude),
       longitude: Number(longitude),
-      year: 2024, //TODO: If data are to be historical, add dynamic year attribute
-      useRealTimeZones: true
+      year: 2024 // NOTE: If data are to be historical, add dynamic year attribute
     };
 
     const solarEvents = getDayLightInfo(calcOptions);
diff --git a/src/types.ts b/src/types.ts
index 877b2e6..23f84e5 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -10,7 +10,6 @@ export interface DaylightCalcOptions {
   latitude: number;
   longitude: number;
   year: number;
-  useRealTimeZones: boolean;
 }
 
 export interface DaylightInfo {
diff --git a/src/utils/daylight-utils.ts b/src/utils/daylight-utils.ts
index 6ddb5ec..994d164 100644
--- a/src/utils/daylight-utils.ts
+++ b/src/utils/daylight-utils.ts
@@ -82,7 +82,7 @@ export function getSunrayAngleInDegrees(dayNum: number, earthTilt: number, lat:n
 }
 
 export function getDayLightInfo(options: DaylightCalcOptions): DaylightInfo[] {
-  const { latitude, longitude, year, useRealTimeZones } = options;
+  const { latitude, longitude, year } = options;
   const results: DaylightInfo[] = [];
 
   let currentDay = dayjs.utc(`${year}-01-01`);
@@ -95,15 +95,8 @@ export function getDayLightInfo(options: DaylightCalcOptions): DaylightInfo[] {
     // TODO: handle above arctic circle and below antarctic circle
     const utcSunrise = dayjs(getSunrise(latitude, longitude, date));
     const utcSunset = dayjs(getSunset(latitude, longitude, date));
-
-    // TODO: Consider removing fake timezone option entirely
-    const tzSunrise = useRealTimeZones
-      ? utcSunrise.tz(timeZone)
-      : utcSunrise.add(Math.round(longitude / 15), "hour");
-
-    const tzSunset = useRealTimeZones
-      ? utcSunset.tz(timeZone)
-      : utcSunset.add(Math.round(longitude / 15), "hour");
+    const tzSunrise = utcSunrise.tz(timeZone)
+    const tzSunset = utcSunset.tz(timeZone)
 
     const record: DaylightInfo = {
       day: currentDay.format("YYYY-MM-DD"),