Sputnik 1 lifted off from Site 1 at Baikonur (Tyuratam), Kazakhstan, at 19:28:34 UTC on 4 October 1957. At the pad the clock read 00:28, already 5 October, and the night sky around it holds a Libra Sun, an Aquarius Moon and Cancer rising. Mars and Jupiter are in Libra with the Sun, and Uranus sits in the 1st house.
At Sputnik's launch the Sun sat in Libra in the 4th house, beneath the ground, because it was just past midnight at Baikonur. It lies about two degrees from the very lowest point of the sky, opposite the Midheaven, with Jupiter less than a degree away and Mars in Libra too. The 4th house is about foundations and where things start, and Libra is the sign of design, proportion and balance. A Sun at the root of the chart suits a beginning.
Uranus, the planet of invention and sudden change, sat in Leo in the 1st house of the Sputnik chart. It's well connected: a sextile to the Sun half a degree from exact, a sextile to Jupiter, and trines to Saturn in Sagittarius and to the Midheaven in Aries. Leo lends it confidence and a sense of occasion. Uranus here reads as a bright, original streak written into the chart's opening house.
The Moon was at 26° Aquarius in the 8th house at this launch, in the sign most tied to the future, science and shared ideas. Cancer was rising at 28°, its final degrees, with Mercury in Virgo making a sextile to the rising degree. Further out, Neptune in Scorpio and Pluto in Virgo sat a tenth of a degree from an exact sextile, a slow, steady link between the two.