When viewing an explored solar system which doesn't have a military presence we can calculate the expected position of (and thus see) the star/planets/etc. But have an inherent error in this calculation which is dependent on the current level of computing power and previous survey information. Eg might start with a 20% error having only flown through the system quickly, which reduces to 10% once a ship has been there for a few months. This can be reduced further by improvements in related technologies, eg telescopes, computers, surveying, etc
When viewing an explored solar system which doesn't have a military presence we can calculate the expected position of (and thus see) the star/planets/etc. But have an inherent error in this calculation which is dependent on the current level of computing power and previous survey information. Eg might start with a 20% error having only flown through the system quickly, which reduces to 10% once a ship has been there for a few months. This can be reduced further by improvements in related technologies, eg telescopes, computers, surveying, etc