SKU: 59466572910

The Mathematics of the Calendar

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Description

The Mathematics of the CalendarThis book will explain the mathematical details behind the Jewish calendar and Easter calculation with a mathematical proposal to fix the Jewish Calendar. In addition, we will explore the mathematics behind the Mayan calendar, Islamic calendar, and our everyday calendar, the Gregorian calendar. First, I will demonstrate how the Jewish calendar works, and how to convert dates between the Jewish calendar to the Gregorian Julian calendar. I will then

This book will explain the mathematical details behind the Jewish calendar and Easter calculation with a mathematical proposal to fix the Jewish Calendar.

In addition, we will explore the mathematics behind the Mayan calendar, Islamic calendar, and our everyday calendar, the Gregorian calendar.

First, I will demonstrate how the Jewish calendar works, and how to convert dates between the Jewish calendar to the Gregorian/Julian calendar. I will then explain the Easter calculation and demonstrate how to use the methods from the Easter calculation to fix the Jewish calendar so that the Jewish calendar stays consistent with the solar cycle.

In 1582, there were two competing proposals to reform the Julian calendar. I will explain the mathematics behind the two proposals. I will explain the proposal that placed Washington, DC on the 77th meridian.

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SKU: 59466572910

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Ram2015
Bozeman, US
★★★★★ 5
Product Quality.
Color: Walnut
⭐️⭐️⭐️⭐️☆ “This stand is sturdy, stylish, and keeps my desk clutter‑free. The walnut wood and aluminum design looks premium, and the dual slots fit both my laptop and tablet securely. A bit pricier than basic stands, but worth it for the quality and organization.”
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Reviewed in the United States on November 16, 2025
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Evan M.
Chelsea, US
★★★★★ 5
Attractive and Functional
Color: Walnut
I bought this to prop up my MacBook Pro M2 to save space on my desk while I am using a dock. The base is nicely adjustable, and holds the laptop securely. Sturdy metal base and attractive wood side pieces. My MacBook has never felt like it might tip, and I have a cat who squeezes past it to reach my office window multiple times per day. If you like the look, I'd highly recommend it for functionality.
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Reviewed in the United States on March 6, 2025
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Brandon
New York, US
★★★★★ 5
Great Tray For Storing My Everyday Carries
Size: 8.5" x 5.8" x 1.9", Color: Black
My everyday carry items (wallet, keys, etc.), used to just get thrown around wherever when I'd get home, but this little tray makes a great, defined, space for me to keep those things when I don't need them on me. The soft lining reduces the obnoxious sound of throwing keys on a hard surface, and of course keeps me from scratching up a surface. The build feels quality and I haven't seen any damage to it yet. Also the all black version with gold buckle looks quite good and adds a subtle touch of luxury. Absolute recommend for the price.
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Reviewed in the United States on April 15, 2026
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David Jordan
Massapequa, US
★★★★★ 5
Just the right size to empty your pockets.
Size: 8.5" x 5.8" x 1.9", Color: Orange
Perfect size to empty my pockets when I get home. Fits my wallet, keys, AirPods, etc. excellent quality.
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Reviewed in the United States on March 21, 2026
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Pilot Wife
Charlottesville, US
★★★★★ 5
Nice and classy
Size: 8.5" x 5.8" x 1.9", Color: Black
Bought this for my husband for Christmas and he loved it. Super classy elegant well made box. Perfect for bedside nightstand for your watch and rings.
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Reviewed in the United States on December 4, 2025

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