The Earth's position in the cosmos 50 years ago would be nearly identical to its current position. While the Earth is constantly in motion, its motion is primarily governed by its orbit around the Sun. The Earth completes one orbit around the Sun in approximately 365.25 days, which defines our calendar year.
The Earth's orbit is nearly circular, and its distance from the Sun does not vary significantly over a span of 50 years. Therefore, the Earth's position relative to the Sun and its immediate surroundings in space would be very similar today compared to 50 years ago.
However, it's important to note that the entire solar system is in motion. The Sun, along with its family of planets, including Earth, orbits around the center of the Milky Way galaxy. This motion is relatively slow on human timescales, and the changes in the Earth's position within the galaxy over a span of 50 years would be negligible.
In summary, while the Earth has been in constant motion over the past 50 years, its position within the cosmos would be extremely close to its position today, with only minor variations due to the ongoing orbital motion within the solar system.