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Difficulty: EasySpecific Detail Inferences

The Julian calendar, introduced by Julius Caesar in 45 BCE, represented a significant advancement in timekeeping by establishing a 365-day year with an additional day added to every fourth year. This system assumed a solar year of exactly 365.25 days. However, the actual solar year—the time it takes for the Earth to complete one revolution around the Sun—is approximately 365.2422 days. Although this annual difference of 11 minutes and 14 seconds seems minuscule, over the centuries, the Julian calendar's slight overestimation of the year's length caused its dates to drift out of alignment with the astronomical seasons. By the late sixteenth century, the vernal equinox, traditionally observed on March 21, was occurring around March 11 on the calendar. This drift presented a serious problem for the Catholic Church, as the calculation of the date of Easter was strictly tied to the vernal equinox. To rectify this discrepancy, Pope Gregory XIII introduced the Gregorian calendar in 1582. The Gregorian reform advanced the calendar by ten days to restore the equinox to March 21. Furthermore, it refined the existing leap year rule to prevent future drift: under the new system, century years would be counted as leap years only if they were divisible by 400. This modification reduced the average year length to 365.2425 days, bringing it much closer to the true solar year.

Based on the passage, which of the following can be inferred about century years under the Julian calendar?

  1. A
    They were treated as leap years only if they could be evenly divided by 400.
  2. B
    They were recognized by the Catholic Church as the primary reason for the shift in the vernal equinox.
  3. They were all treated as leap years, regardless of whether they were divisible by 400.Answer
  4. D
    They were the exclusive cause of the annual discrepancy of 11 minutes and 14 seconds.
  5. E
    They were eliminated entirely from the calendar system by Pope Gregory XIII.

Answer

They were all treated as leap years, regardless of whether they were divisible by 400.
The correct answer accurately synthesizes the Julian calendar's rule (adding a day to 'every fourth year') with the Gregorian refinement (century years are leap years 'only if they were divisible by 400'). This necessarily implies that prior to the Gregorian refinement, all century years were treated as leap years under the Julian system, because they naturally fell on the four-year cycle and lacked the new restriction.

Step-by-Step Solution

1
Analyze the leap year rule established by the Julian calendar as described in the passage.
The Julian calendar established 'an additional day added to every fourth year.'
To understand the baseline rule for leap years before any reforms took place.
2
Analyze the Gregorian refinement to the leap year rule.
The Gregorian calendar dictated that 'century years would be counted as leap years only if they were divisible by 400.'
To determine what specific change was made regarding century years.
3
Infer the Julian calendar's treatment of century years by synthesizing the two rules.
Since the Gregorian rule had to explicitly restrict century leap years to those divisible by 400, the preceding Julian rule of 'every fourth year' must have resulted in all century years being treated as leap years.
To answer the inference question directly by logically combining explicit details.

Key Concept

Synthesizing explicit details to draw a valid logical inference about a historical system.
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Specific Detail Inferences

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