Hi Veronica,
That's an interesting question.
People have been watching the sky for thousands of years, but we don't have written records for all of human history. I think it would be impossible to say exactly who was the very first person to ever observe a solar eclipse. However, the earliest recorded observations of solar eclipses may come from China around 1600-1050 BC. You can learn more about these early eclipse observations here: http://eclipse99.nasa.gov...itions_morechina.htm
Kris