To easily answer this question, we should note the following: Earth takes 24 hours to rotate, which means that there are 24 hours in a day. One hour has 60 minutes and one minute has 60 seconds. Now, taking the given information, we can finally compute how many seconds are there in a day. To compute, use this formula: 1 day is equal to 24 hours times 60 minutes times 60 seconds.
With this, we can get the answer that there are 86,400 seconds in a day. However, it is worthy to note that if we are going to use the Earth’s rotation with respect to the stars, we will have 23 hours, 56 minutes and 4.1 seconds in a day. If we are going to use this information, then we will have the answer of 86,164.0916 seconds in a day.