This is because at this time the southern half of the planet is tilted towards the Sun. It is cooler during the rest of the year when the northern half of the planet is tilted towards the Sun. Earth has one Moon. The Moon has been an important part of culture, literature and mythology since time began. The Moon is about one-fourth the size of Earth, with a diameter of a little over 3200 kilometers.
Earth is the only planet in the solar system that has solar eclipses.
These happen when the Moon hides the Sun. Earth is the only planet which supports animal and plant life. Also, it is the only planet with oceans of warm water.