Final answer:
The statement is false; both the Milankovitch cycles and the sun's strength have varied over time due to changes in Earth's orbit and solar activity, influencing Earth's climate.
Step-by-step explanation:
The statement that the timing of the Milankovitch cycles and the strength of the sun have never changed through time is false.
Milankovitch cycles consist of three main variations in Earth's orbit: eccentricity, axial tilt (obliquity), and precession. These cycles affect the amount of solar energy Earth receives, influencing long-term climate patterns and contributing to the timing of ice ages. The cycles have different lengths: eccentricity varies over approximately 100,000-year and 413,000-year cycles, obliquity over about 41,000-year cycles, and precession over roughly 26,000-year cycles. In addition to these patterns, variations in Earth's eccentricity also occur on longer timescales of 400,000 years and 2.4 million years, while obliquity has a 1.2 million-year cycle.
Moreover, the sun's energy output is not constant but varies over the centuries. Evidence for variations in solar activity includes historical sunspot records, such as the Maunder Minimum, when sunspot activity was much lower than average.