**Definitions:**

**Second** (abbreviations: **sec, or s, or s (SI), or sec (US)**): is the base unit of time in the International System of Units (SI, Système International d'Unités). It is the second division of the hour by sixty, where the first division by sixty being the minute.

**Day** (abbreviations: **dy, or d**): is a unit of time. In common usage, it is either an interval equal to 24 hours or daytime, the consecutive period of time during which the Sun is above the horizon. As well, it is equivalent to a solar day, the period of time during which the Earth completes one rotation with respect to the Sun.

## How to Convert Seconds to Days

*Example: How many days are equivalent to 57.35 seconds?*

As;

1 seconds = 1.1574E-5 days

57.35 seconds = Y days

Assuming Y is the answer, and by criss-cross principle;

Y equals 57.35 times 1.1574E-5 over 1

(i.e.) Y = 57.35 * 1.1574E-5 / 1 = 0.0006637689 days

Answer is: 0.0006637689 days are equivalent to 57.35 seconds.

*Practice Question: Convert the following units into dy:*

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 15.3 sec

( ii ) 1.81 sec

( iii ) 55.68 sec