It is not hard to spot satellites. Satellites can easily be seen under the following conditions:
- They are easier to see the larger and the closer they are.
- The darker the sky, the easier to see them.
- Satellites are visible only when they are lit by the sunlight.
Because of these conditions, satellites are usually seen a few hours after sunset or a few hours before sunrise.
Flat-Earthers claim that satellites can never be seen, and the fact is evidence that “satellites don’t exist”. They are wrong. Satellites can easily be seen under the right conditions.
Satellites don’t have their own light source, and can only be seen if lit by the sunlight. The problem is that during the day, they are hard to see because the sky is very bright. The good time to watch satellites is when the Sun is just below the horizon, which is before sunrise or after sunset. In such moments, satellites above us are lit by sunlight, but the sky can be dark enough for us to be able to see satellites.
Practically all satellites are smaller than commercial airplanes. They are usually not larger than a small bus. They are also multiple times farther than the typical passenger airplanes. The bigger and the closer they are, the more visible they are. Satellites will appear like a fast moving star across the sky.
Some flat-Earthers demand that we must be able to discern the shape of the satellite before they can accept that satellites exist. To illustrate how this demand is unrealistic, we’ll use the ISS as our example. The ISS is as large as a football field, but the distance to ISS is more than the distance from London to Paris. Obviously, it is unrealistic to spot a football field at a distance similar to the distance from Paris to London and still be able to identify it as a football field using our naked eye. Using our naked eye, the ISS will appear like a fast moving bright dot across the sky.
Websites like heavens-above.com provide predictions of satellite watching opportunities.