There are several ways to observe the Earth's curvature with your own eyes, even if you don't have a lot of resources. Here are a few methods:

Observe the horizon from a high vantage point: Find a location that offers a clear view of the horizon, such as a hilltop or a tall building. As you look out into the distance, you'll notice that the horizon appears to curve downwards on all sides. This is because the Earth's surface is curved.

Watch a ship disappear over the horizon: When a ship sails away from you, it gradually disappears from view, starting from the bottom up. This is because the ship is moving over the curved surface of the Earth, and eventually the curvature of the Earth blocks your view of the ship's lower portions.

Observe the shape of the Earth's shadow during a lunar eclipse: During a lunar eclipse, the Earth casts a shadow on the Moon. The shape of the shadow is always curved, which is further evidence that the Earth is a sphere.

Observe the stars: If you watch the night sky from different locations on Earth, you'll notice that the position of the stars changes slightly. This is because the Earth's surface is curved, and your viewing angle changes as you move across the surface. If the Earth were flat, the position of the stars would remain the same no matter where you were on the planet.

These are just a few examples of ways to observe the Earth's curvature without any special equipment or resources. Of course, there are many more scientific methods and experiments that can be used to demonstrate the shape of the Earth, but these simple observations can be a good starting point.
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