DST inherits and can magnify the disadvantages of standard time. For example, when reading a sundial, one must compensate for it along with time zone and natural discrepancies. Also, sun-exposure guidelines such as avoiding the sun within two hours of noon become less accurate when DST is in effect.
When using a sundial, we must adjust the reading to reflect natural discrepancies and the effect of what other influence?
{'text': 'time zone', 'answer_start': 140}