hourly basis - translation to ελληνικό
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hourly basis - translation to ελληνικό

NUMBER OF METEORS A SINGLE OBSERVER WOULD SEE IN AN HOUR OF PEAK ACTIVITY FOR THE METEOR SHOWER
Zenith Hourly Rate; Zenith hourly rate; Zenithal Hourly Rate
  • All-sky view of the 1998 [[Leonids]] shower. 156 meteors were captured in this 4-hour image.

hourly basis      
ωριαία βάση
ωριαία βάση      
hourly basis
income account         
TIME WHEN FINANCIAL TRANSACTIONS ARE REPORTED
Cash basis accounting; Accounting methods; Cash-basis verses accrual-basis accounting; Income account; Cash-basis versus accrual-basis accounting; Income Account; Cash Method v. Accrual Method; Comparison of the Cash Method and Accrual Method of accounting; Comparison of cash method and accrual method of accounting; Comparison of Cash Method and Accrual Method of accounting; Accrual method; Accrual method of accounting; Comparison of cash and accrual methods of accounting; Accounting method
εισοδηματικός λογαριασμός

Ορισμός

basis
n.
1) to form, provide a basis for
2) a firm, solid, sound; first-name; scientific; shaky basis
3) on a basis (on a solid basis; she was promoted on the basis of her accomplishments; to be paid on an hourly basis; to be on a first-name basis)

Βικιπαίδεια

Zenithal hourly rate

In astronomy, the zenithal hourly rate (ZHR) of a meteor shower is the number of meteors a single observer would see in an hour of peak activity if it was at the zenith, assuming the seeing conditions are excellent (when and where stars with apparent magnitudes up to 6.5 are visible to the naked eye). The rate that can effectively be seen is nearly always lower and decreases the closer the radiant is to the horizon.

The formula to calculate the ZHR is:

Z H R = H R ¯ F r 6.5 l m sin ( h R ) {\displaystyle ZHR={\cfrac {{\overline {HR}}\cdot F\cdot r^{6.5-lm}}{\sin(h_{R})}}}

where

H R ¯ = N T e f f {\displaystyle {\overline {HR}}={\cfrac {N}{T_{eff}}}}

represents the hourly rate of the observer. N is the number of meteors observed, and Teff is the effective observation time of the observer.

Example: If the observer detected 12 meteors in 15 minutes, their hourly rate was 48 (12 divided by 0.25 hours).

F = 1 1 k {\displaystyle F={\cfrac {1}{1-k}}}

This represents the field of view correction factor, where k is the percentage of the observer's field of view which is obstructed (by clouds, for example).

Example: If 20% of the observer's field of view were covered by clouds, k would be 0.2 and F would be 1.25. The observer should have seen 25% more meteors, therefore multiply by F = 1.25.

r 6.5 l m {\displaystyle r^{6.5-lm}}

This represents the limiting magnitude correction factor (Population index). For every change of 1 magnitude in the limiting magnitude of the observer, the number of meteors observed changes by a factor of r. Therefore, this must be taken into account.

Example: If r is 2, and the observer's limiting magnitude is 5.5, the hourly rate is multiplied by 2 (2 to the power 6.5–5.5), to know how many meteors they would have seen if their limiting magnitude was 6.5.

sin ( h R ) {\displaystyle \sin(h_{R})}

This represents the correction factor for the altitude of the radiant above the horizon (hR). The number of meteors seen by an observer changes as the sine of the radiant height.

Example: If the radiant was at an average altitude of 30° during the observation period, the observer's hourly rate will need to be divided by 0.5 (sin 30°) to know how many meteors they would have seen if the radiant was at the zenith.

Παραδείγματα από το σώμα κειμένου για hourly basis
1. The economy changes on a daily, even hourly basis.
2. Regulators have been in touch with Lehman on an almost hourly basis in recent days.
3. Advertisement Take for example workers who work on an hourly basis.
4. His condition is being monitored on an hourly basis,» Verma told mediapersons outside the hospital here.
5. In 1''', men earned 13 percent more than their female colleagues on an hourly basis.