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Julian Day Formula

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Julian Day refers to a system of timekeeping that is commonly used to synchronize various operations and events. Check FAQs

JD = (t ref \cdot JC) + JD ref

JD - Julian Day?t_ref - Reference Time?JC - Julian Century?JD_ref - Julian Day Reference?

Julian Day Example

With values

With units

Only example

Here is how the Julian Day equation looks like with Values.

Here is how the Julian Day equation looks like with Units.

Here is how the Julian Day equation looks like.

427 = (1.4 \cdot 300) + 7

427d = (1.4 \cdot 300d) + 7d

427 = (1.4 \cdot 300) + 7

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Julian Day Solution

Follow our step by step solution on how to calculate Julian Day?

FIRST Step Consider the formula

JD = (t ref \cdot JC) + JD ref

Next Step Substitute values of Variables

∴

JD = (1.4 \cdot 300d) + 7d

Next Step Convert Units

∴

JD = (1.4 \cdot 2.6E+7s) + 604800s

Next Step Prepare to Evaluate

∴

JD = (1.4 \cdot 2.6E+7) + 604800

Next Step Evaluate

∴

JD = 36892800s

LAST Step Convert to Output's Unit

∴

JD = 427d

Julian Day Formula Elements

Variables

Julian Day

Julian Day refers to a system of timekeeping that is commonly used to synchronize various operations and events.

Symbol: JD

Measurement: TimeUnit: d

Note: Value can be positive or negative.

Formulas to find Julian Day

Reference Time

Reference Time is the time period for which statistical results are collected or calculated and to which, as a result, these values refer.

Symbol: t_ref

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Reference Time

Julian Century

Julian Century is used to simplify calculations of the positions of celestial objects in the sky, such as the sun, moon, and planets.

Symbol: JC

Measurement: TimeUnit: d

Note: Value can be positive or negative.

Formulas to find Julian Century

Julian Day Reference

The Julian day reference is a system used to represent dates and times in a standardized format.

Symbol: JD_ref

Measurement: TimeUnit: d

Note: Value should be greater than 0.

Formulas to find Julian Day Reference

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How to Evaluate Julian Day?

Julian Day evaluator uses Julian Day = (Reference Time*Julian Century)+Julian Day Reference to evaluate the Julian Day, The Julian Day formula is defined as the continuous count of days since the beginning of the Julian period, and is used primarily by astronomers, and in software for easily calculating elapsed days between two events. Julian Day is denoted by JD symbol.

How to evaluate Julian Day using this online evaluator? To use this online evaluator for Julian Day, enter Reference Time (t_ref), Julian Century (JC) & Julian Day Reference (JD_ref) and hit the calculate button.

FAQs on Julian Day

What is the formula to find Julian Day?

The formula of Julian Day is expressed as Julian Day = (Reference Time*Julian Century)+Julian Day Reference. Here is an example- 0.004942 = (1.4*25920000)+604800.

How to calculate Julian Day?

With Reference Time (t_ref), Julian Century (JC) & Julian Day Reference (JD_ref) we can find Julian Day using the formula - Julian Day = (Reference Time*Julian Century)+Julian Day Reference.

Can the Julian Day be negative?

Yes, the Julian Day, measured in Time can be negative.

Which unit is used to measure Julian Day?

Julian Day is usually measured using the Day[d] for Time. Second[d], Millisecond[d], Microsecond[d] are the few other units in which Julian Day can be measured.

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Julian Day Formula

Julian Day Example

Julian Day Solution

Julian Day Formula Elements

Other formulas in Satellite Orbital Characteristics category

How to Evaluate Julian Day?

FAQs on Julian Day

Variable Name