**Definitions:**

**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.

**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.

## How to Convert Days to Seconds

*Example: How many seconds are equivalent to 45.55 days?*

As;

1 days = 86400 seconds

45.55 days = Y seconds

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

Y equals 45.55 times 86400 over 1

(i.e.) Y = 45.55 * 86400 / 1 = 3935520 seconds

Answer is: 3935520 seconds are equivalent to 45.55 days.

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

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

( i ) 57.9 dy

( ii ) 47.52 dy

( iii ) 48.48 dy