Can we quickly determine which hemisphere the user is located in?

Currently, I am involved in a project that involves seasonal content. We are considering using the user's location to determine what season they are experiencing. One approach is to Geo-locate their IP address and then identify whether the latitude is greater than zero (indicating Northern hemisphere) or less than zero (indicating Southern hemisphere).

While this method may work, it seems excessive to pinpoint a person's exact location just to ascertain which half of the planet they are situated in. However, I wanted to see if anyone has any alternative techniques that could streamline this process.

Whether it's looking at request headers or extracting information through JS on the client side, there are various ways to gather data. Nevertheless, none of these methods seem particularly helpful in achieving our goal.

javascripthttpgeolocation

Answer №1

To determine the client's location, start by checking their clock to see if daylight savings time is in effect on their calendar. This can provide insight into whether they are located north or south of the equator.

If there is no daylight savings information available, consider using geolocation services. Alternatively, you can ask the user directly if they are situated south of the equator.

window.whatHemisphere= (function(){
    var y = new Date().getFullYear();
    if(y.getTimezoneOffset() == undefined) return null;
    var jan = -(new Date(y, 0, 1, 0, 0, 0, 0).getTimezoneOffset()),
    jul = -(new Date(y, 6, 1, 0, 0, 0, 0).getTimezoneOffset()),
    diff = jan - jul;
    if(diff > 0) return 'N';
    if(diff < 0) return 'S'
    return null;
})()

Answer №3

The solution provided by @kennebec is quite intelligent, however, it appears to be lacking in thorough testing. Below is an alternative code snippet that has been tried and tested for accuracy. It does not address the issue of locations that do not observe daylight savings time.

function findHemisphere() {
    let currentYear = new Date();
    if (currentYear.getTimezoneOffset == undefined) return null;
    currentYear = currentYear.getFullYear();
    let januaryTZ = -(new Date(currentYear, 0, 1, 0, 0, 0, 0).getTimezoneOffset());
    let julyTZ = -(new Date(currentYear, 6, 1, 0, 0, 0, 0).getTimezoneOffset());
    let timeDifference = januaryTZ - julyTZ;
    if (timeDifference < 0) return 'Northern Hemisphere';
    if (timeDifference > 0) return 'Southern Hemisphere';
    return null;
}

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