【翻譯練習】3 月和 11 月的每一天，都對應到相同的星期幾？
Do March and November have the same days of a week for the respective dates?
來源：https://hubpages.com/games-hobbies/forum/276105/do-march-and-november-have-the-same-days-of-a-week-for-the-respective-dates
Any date in March is same day of the week as the corresponding date in November of that year. Yes or No?
假如 3 月 1 日是星期一，那麼同一年的 11 月 1 日也會是星期一，這兩個月份的日期和星期是可以完全對應的嗎？
Yes, in fact, they do, and a little "everyday math" can explain why.
沒錯，而且只要用到一點點「生活數學」，就可以說明這個原因。
With seven days in a week, all months except for non-leap-year February have a few days more than a number of exactly complete weeks. That is, 28 days equal exactly four weeks by the calendar. So, the months with 30 days (April, June, and September) have two days more than exactly four weeks. The months with 31 days (March, May, July, August, and October) have three days more than exactly four weeks. (I'm only including the months from the beginning of March up to the beginning of November.)
一星期有 7 天，所以除了非閏年的 2 月以外，每個月都會多出幾天未滿一星期的天數。詳細來說，28 天等於日曆上的 4 星期，所以天數是 30 天的月份 (4、6、9 月) 是 4 星期多 2 天，31 天的月份 (3、5、7、8、10 月) 是 4 星期多 3 天 (這裡只計算 3 月初到 11 月初這中間的月份)。
All of the "extra" days (3 x 2; 5 x 3) add up to 21 extra days, or exactly three weeks. Since all of the days from the beginning of March up to the beginning of November equal an exact number of weeks, then whatever day of the week was March 1 will be the same day on which November 1 occurs. And so forth.
這些「多出來」的天數 (3 個月 x 2 天；5 個月 x 3 天) 加起來一共是 21 天，恰好是 3 星期。因為3 月初到 11 月初這中間的天數，剛剛好可以湊成完整的星期，所以 3 月 1 日是星期幾，11 月 1 日也會是星期幾，其後以此類推。
For the same reason (exact weeks), September and December dates fall on the same days of the week. September and November have 30 days (therefore 4 extra days between the two of them) and October has three extra days; 4+3=7, or exactly one week.
同理 (天數可以湊成完整的星期)，9 月和 12 月的幾號星期幾也會是一樣的數目字。9 月和 11 月有 30 天 (2 個月 x 多出 2 天 = 4 天)，10 月有 31天，是 4 星期多 3 天，4 天 + 3 天 = 7 天，剛好一星期。
There are other pairs, depending on whether it's leap-year or not: in non-leap-years, April+July; leap-year adds January to those 2; in non-leap-years, January+October; in non-leap-years February+March+November.
除了 3 月/11 月以外，還有其他月份配對也有這種日期與星期相對應的情形，要看該年是不是閏年：非閏年－－4 月/7 月、1 月/10 月、2 月/3 月/11 月；閏年－－1 月/4 月/7 月。
來源：https://hubpages.com/games-hobbies/forum/276105/do-march-and-november-have-the-same-days-of-a-week-for-the-respective-dates
Any date in March is same day of the week as the corresponding date in November of that year. Yes or No?
假如 3 月 1 日是星期一，那麼同一年的 11 月 1 日也會是星期一，這兩個月份的日期和星期是可以完全對應的嗎？
Yes, in fact, they do, and a little "everyday math" can explain why.
沒錯，而且只要用到一點點「生活數學」，就可以說明這個原因。
With seven days in a week, all months except for non-leap-year February have a few days more than a number of exactly complete weeks. That is, 28 days equal exactly four weeks by the calendar. So, the months with 30 days (April, June, and September) have two days more than exactly four weeks. The months with 31 days (March, May, July, August, and October) have three days more than exactly four weeks. (I'm only including the months from the beginning of March up to the beginning of November.)
一星期有 7 天，所以除了非閏年的 2 月以外，每個月都會多出幾天未滿一星期的天數。詳細來說，28 天等於日曆上的 4 星期，所以天數是 30 天的月份 (4、6、9 月) 是 4 星期多 2 天，31 天的月份 (3、5、7、8、10 月) 是 4 星期多 3 天 (這裡只計算 3 月初到 11 月初這中間的月份)。
All of the "extra" days (3 x 2; 5 x 3) add up to 21 extra days, or exactly three weeks. Since all of the days from the beginning of March up to the beginning of November equal an exact number of weeks, then whatever day of the week was March 1 will be the same day on which November 1 occurs. And so forth.
這些「多出來」的天數 (3 個月 x 2 天；5 個月 x 3 天) 加起來一共是 21 天，恰好是 3 星期。因為3 月初到 11 月初這中間的天數，剛剛好可以湊成完整的星期，所以 3 月 1 日是星期幾，11 月 1 日也會是星期幾，其後以此類推。
For the same reason (exact weeks), September and December dates fall on the same days of the week. September and November have 30 days (therefore 4 extra days between the two of them) and October has three extra days; 4+3=7, or exactly one week.
同理 (天數可以湊成完整的星期)，9 月和 12 月的幾號星期幾也會是一樣的數目字。9 月和 11 月有 30 天 (2 個月 x 多出 2 天 = 4 天)，10 月有 31天，是 4 星期多 3 天，4 天 + 3 天 = 7 天，剛好一星期。
There are other pairs, depending on whether it's leap-year or not: in non-leap-years, April+July; leap-year adds January to those 2; in non-leap-years, January+October; in non-leap-years February+March+November.
除了 3 月/11 月以外，還有其他月份配對也有這種日期與星期相對應的情形，要看該年是不是閏年：非閏年－－4 月/7 月、1 月/10 月、2 月/3 月/11 月；閏年－－1 月/4 月/7 月。
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