Understanding insolation is important. If you think in terms of light bulbs, then what Milankovic proposed was that changes in the orbit caused long-term changes in the summer and winter insolation over periods of hundreds of thousands of years. If the summer insolation gives 400 W/m2 (4 light bulbs), then the winter will typically give 180 W/ m2 (less than 2 light bulbs). That is why winter is colder. Less light bulbs of power from the sun. The long-term orbital changes cause the winter and summer insolation to change over time. So if the summer right now is 400 W/m2, 5,000 years from now the
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