I’m trying to use astrological days and years to figure out different conversions of time. I may need to refine my list but here it is so far. You can see why I’m doing this if you visit my blog post for my Proficiency Calculator.
Yearly Basis Conversions
1. Year to Months
• 1 year = 12 months
• 1 month = 0.08333 years (1/12)
2. Year to Weeks
• 1 year = 52.1775 weeks (365.25 days / 7 days, accounting for leap years)
• 1 week = 0.01917 years (1/52.1775)
3. Year to Days
• 1 year = 365.25 days (accounting for leap years)
• 1 day = 0.00274 years (1/365.25)
4. Year to Hours
• 1 year = 8,766 hours (365.25 days * 24 hours)
• 1 hour = 0.00011407955 years (1/8,766)
5. Year to Minutes
• 1 year = 525,960 minutes (365.25 days * 24 hours * 60 minutes)
• 1 minute = 0.0000019013 years (1/525,960)
6. Year to Seconds
• 1 year = 31,557,600 seconds (365.25 days * 24 hours * 60 minutes * 60 seconds)
• 1 second = 0.000000031688 years (1/31,557,600)
Larger and Smaller Time Units
1. Decades, Centuries, and Millennia to Years
• 1 decade = 10 years
• 1 century = 100 years
• 1 millennium = 1,000 years
2. Months to Weeks and Days
• 1 month ≈ 4.348 weeks (average, considering 1 year = 52.1775 weeks)
• 1 month ≈ 30.44 days (average, considering 1 year = 365.25 days)
3. Weeks to Days
• 1 week = 7 days
4. Days to Hours, Minutes, and Seconds
• 1 day = 24 hours
• 1 day = 1,440 minutes (24 hours * 60 minutes)
• 1 day = 86,400 seconds (24 hours * 60 minutes * 60 seconds)
Special Units
1. Quarter to Months
• 1 quarter = 3 months
• 1 month = 0.33333 quarters (1/3)
2. Fortnight to Weeks and Days
• 1 fortnight = 2 weeks
• 1 fortnight = 14 days
• 1 week = 0.5 fortnights
• 1 day = 0.07143 fortnights (1/14)
From Years
1. Year to Months
• 1 year = 12 months
• 1 month = 1/12 year ≈ 0.08333 years
2. Year to Weeks
• 1 year ≈ 52.1775 weeks (365.25 days/year ÷ 7 days/week)
• 1 week = 1/52.1775 year ≈ 0.01916 years
3. Year to Days (considering leap years)
• 1 year = 365.25 days
• 1 day = 1/365.25 year ≈ 0.00274 years
4. Year to Hours
• 1 year = 8766 hours (365.25 days/year × 24 hours/day)
• 1 hour = 1/8766 year ≈ 0.000114 years
5. Year to Minutes
• 1 year = 525,960 minutes (365.25 days/year × 24 hours/day × 60 minutes/hour)
• 1 minute = 1/525,960 year ≈ 0.00000190 years
6. Year to Seconds
• 1 year = 31,557,600 seconds (365.25 days/year × 24 hours/day × 60 minutes/hour × 60 seconds/minute)
• 1 second = 1/31,557,600 year ≈ 0.0000000317 years
From Months (Based on a Year of 365.25 Days)
1. Month to Days
• Average = 365.25 days/year ÷ 12 months/year ≈ 30.4375 days/month
2. Month to Weeks
• Average ≈ 30.4375 days/month ÷ 7 days/week ≈ 4.348 weeks/month
3. Month to Hours
• Average = 30.4375 days/month × 24 hours/day ≈ 730.5 hours/month
4. Month to Minutes
• Average = 730.5 hours/month × 60 minutes/hour = 43,830 minutes/month
5. Month to Seconds
• Average = 43,830 minutes/month × 60 seconds/minute = 2,629,800 seconds/month
From Weeks
1. Week to Days
• 1 week = 7 days
2. Week to Hours
• 1 week = 7 days/week × 24 hours/day = 168 hours/week
3. Week to Minutes
• 1 week = 168 hours/week × 60 minutes/hour = 10,080 minutes/week
4. Week to Seconds
• 1 week = 10,080 minutes/week × 60 seconds/minute = 604,800 seconds/week
From Days
1. Day to Hours
• 1 day = 24 hours
2. Day to Minutes
• 1 day = 24 hours/day × 60 minutes/hour = 1,440 minutes/day
3. Day to Seconds
• 1 day = 1,440 minutes/day × 60 seconds/minute = 86,400 seconds/day
Additional Units
1. Decade to Years
• 1 decade = 10 years
2. Century to Years
• 1 century = 100 years
3. Millennium to Years
• 1 millennium = 1,000 years
4. Quarter to Months
• 1 quarter = 3 months
5. Fortnight to Days
• 1 fortnight = 14 days
Standard Time Units
1. Second to Minute
• 1 minute = 60 seconds
2. Minute to Hour
• 1 hour = 60 minutes
3. Hour to Day
• 1 day = 24 hours
4. Day to Week
• 1 week = 7 days
5. Week to Fortnight
• 1 fortnight = 2 weeks
6. Week to Month (Average)
• 1 month ≈ 4.348 weeks
7. Month to Year
• 1 year = 12 months
8. Year to Decade
• 1 decade = 10 years
9. Decade to Century
• 1 century = 10 decades
10. Century to Millennium
• 1 millennium = 10 centuries
Extending to Larger Scales
11. Millennium to Megaannum (Ma)
• 1 Ma = 1 million years
• 1 millennium = 0.001 Ma
12. Millenniums in Eons
• Eons are not strictly defined in years; they are the largest time units used in geology and cosmology, typically spanning hundreds of millions to billions of years. For context, 1 eon ≈ several hundred to over a thousand Ma.
Detailed Conversions Within a Year
13. Months in a Millennium
• 1 millennium = 12,000 months (1,000 years × 12 months/year)
14. Weeks in a Millennium
• 1 millennium ≈ 521,775 weeks (1,000 years × 52.1775 weeks/year)
15. Days in a Millennium
• 1 millennium = 365,250 days (1,000 years × 365.25 days/year)
16. Hours in a Millennium
• 1 millennium = 8,766,000 hours (1,000 years × 8,766 hours/year)
17. Minutes in a Millennium
• 1 millennium = 525,960,000 minutes (1,000 years × 525,960 minutes/year)
18. Seconds in a Millennium
• 1 millennium = 31,557,600,000 seconds (1,000 years × 31,557,600 seconds/year)
Vast Time Scales
19. Millenniums in an Eon
• Given the broad definition of an eon, if we consider an eon to be, minimally, hundreds of millions of years, then an eon contains at least 100,000 millenniums.
20. Eons in the Age of the Universe
• The age of the universe is estimated to be about 13.8 billion years. This can be roughly divided into 13,800 Ma or 13.8 eons, if one were to very loosely define an eon as 1 billion years for simplicity.
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