diff --git a/src/components/App.tsx b/src/components/App.tsx
index 4bbb746..b41c318 100755
--- a/src/components/App.tsx
+++ b/src/components/App.tsx
@@ -19,7 +19,7 @@ export const App: React.FC = () => {
   const [activeTab, setActiveTab] = useState<"location" | "simulation">("location");
   const [latitude, setLatitude] = useState("");
   const [longitude, setLongitude] = useState("");
-  const [dayOfYear, setDayOfYear] = useState(171);
+  const [dayOfYear, /*setDayOfYear */] = useState(171);
   const [locations, setLocations] = useState<ILocation[]>([]);
   const [locationSearch, setLocationSearch] = useState<string>("");
   const [selectedAttrs, setSelectedAttributes] = useState<string[]>(kDefaultOnAttributes);
@@ -34,20 +34,21 @@ export const App: React.FC = () => {
     // of the sync process, when user select a row in CODAP and we want to update the day in the simulation tab.
   };
 
-  const handleCaseSelectionInCodap = (_latitude: string, _longitude: string, day: number) => {
-    // Option 1. Update as much of the plugin state as we can when user selects a case in CODAP. I think this might
-    // be too much, as it'll clear all the inputs in all the tabs and the user will have to re-enter everything
-    // if they were in the middle of something.
-    // setDayOfYear(day);
-    // setLatitude(_latitude);
-    // setLongitude(_longitude);
-    // ...OR...
-    // Option 2. Update only the day of the year, as that's reasonably unobtrusive and useful. We can first check
-    // if user actually selected the case from the same location, and only then update the day of the year.
-    if (latitude === _latitude && longitude === _longitude) {
-      setDayOfYear(day);
-    }
-  }
+  // TODO: Handle case selection - sync sim tab with CODAP selection
+  // const handleCaseSelectionInCodap = (_latitude: string, _longitude: string, day: number) => {
+  //   // Option 1. Update as much of the plugin state as we can when user selects a case in CODAP. I think this might
+  //   // be too much, as it'll clear all the inputs in all the tabs and the user will have to re-enter everything
+  //   // if they were in the middle of something.
+  //   // setDayOfYear(day);
+  //   // setLatitude(_latitude);
+  //   // setLongitude(_longitude);
+  //   // ...OR...
+  //   // Option 2. Update only the day of the year, as that's reasonably unobtrusive and useful. We can first check
+  //   // if user actually selected the case from the same location, and only then update the day of the year.
+  //   if (latitude === _latitude && longitude === _longitude) {
+  //     setDayOfYear(day);
+  //   }
+  // }
 
   const { getUniqueLocationsInCodapData } = useCodapData();
   // Store a ref to getUniqueLocationsInCodapData so we can call inside useEffect without triggering unnecessary re-runs
diff --git a/src/utils/daylight-utils.ts b/src/utils/daylight-utils.ts
index d8a1c52..c13ec71 100644
--- a/src/utils/daylight-utils.ts
+++ b/src/utils/daylight-utils.ts
@@ -28,13 +28,14 @@ function getDayLength(sunrise: Dayjs, sunset: Dayjs): number {
   return dayLength;
 }
 
-function hasDST(latitude: number, longitude: number, year: number): boolean {
-  const timeZone = tzlookup(latitude, longitude);
-  const winterDate = dayjs.tz(`${year}-01-01`, timeZone);
-  const summerDate = dayjs.tz(`${year}-07-01`, timeZone);
+// Uncomment this to use in the DST adjustment commented out below
+// function hasDST(latitude: number, longitude: number, year: number): boolean {
+//   const timeZone = tzlookup(latitude, longitude);
+//   const winterDate = dayjs.tz(`${year}-01-01`, timeZone);
+//   const summerDate = dayjs.tz(`${year}-07-01`, timeZone);
 
-  return winterDate.utcOffset() !== summerDate.utcOffset();
-}
+//   return winterDate.utcOffset() !== summerDate.utcOffset();
+// }
 
 function getSeasonName(dayJsDay: Dayjs, latitude: number): string {
   const year = dayJsDay.year();
@@ -73,7 +74,7 @@ function getSeasonName(dayJsDay: Dayjs, latitude: number): string {
   return season;
 }
 
-export function getSolarNoonIntensity(dayNum: number, latitude: number): number | null {
+export function getSolarNoonIntensity(dayNum: number, latitude: number): number {
   const solarConstant = 1361;
   const latitudeRad = latitude * Math.PI / 180;
   const declination = 23.45 * Math.sin((360/365) * (dayNum - 81) * Math.PI / 180);
@@ -87,7 +88,7 @@ export function getSolarNoonIntensity(dayNum: number, latitude: number): number
   return solarNoonIntensity;
 }
 
-export function getSunrayAngleInDegrees(dayNum: number, earthTilt: number, lat:number): number | null {
+export function getSunrayAngleInDegrees(dayNum: number, earthTilt: number, lat:number): number {
   const tiltAxisZRadians = 2 * Math.PI * (dayNum - kBasicSummerSolstice) / 365;
   const orbitalTiltDegrees = earthTilt ? earthTilt : 0;
   const effectiveTiltDegrees = -Math.cos(tiltAxisZRadians) * orbitalTiltDegrees;