Why it is summer in Australia when it is winter in the US?

Answer 1

The Earth is tilted on an axis and travels around the Sun while spinning on this axis. For three months of the year, the Northern Hemisphere is leaning towards the Sun while the Southern Hemisphere isn't. This is when it's summer in the Northern Hemisphere and winter in the Southern. Here, the Sun's rays are targeted towards the Tropic of Cancer. For another three months, the same scenario is present but vice versa, meaning it's summer in the Southern Hemisphere and winter in the Northern. Here, the Sun's rays are targeted on the Tropic of Capricorn. However, for six months of the year (three months at a time), both hemispheres are typically aligned, making the Sun's rays directed towards the center of the Earth: the Equator. This is when it is either fall or spring, alternating depending on the hemisphere.

Australia is in the Southern Hemisphere when the United States is in the Northern Hemisphere. So when it's summer in Australia, it will be winter in the US because the Sun's rays are as far from the US as possible and as close to Australia as possible: the Tropic of Capricorn.