Finger Measuring
How to calculate the angular size of my finger in degreese?
This is for an astronomy course. The lab requires us to measure the distance in between stars ..ect by using our fingers and fists...I need to know how to measure the angular size of my finger in degrees to finish the lab...Im having a hard time understanding the formulas given to me (via the internet and instructor) so if some one could please put detailed and specific instruction on how to do this.
thank you in advance
* sleep deprived and confused*
Measure the width, then measure the distance from your finger from your eye when fully stretched.
Width of finger ~ 1 cm (roughly)
Distance from eye to finger when arm is stretched ~ 60 cm (measure yours, this will vary a bit)
Assume a right triangle with one vertex as your eye in which the finger is the smaller side, so the angle it subtends ~ 1/60 radians ~ 1 degree
(We are using the fact that for small angles tan x ~ x)
An easy way to measure fists etc is to note that from zenith to horizon there is 90 degrees. Now check how many fists you can fit in. Divide by that and you'll get the size of your fist. Check how many fingers you can fit into a fist, so you get your fist's angular spread. Or the other way, once you know a finger ~ 1 degree, you can calculate the fist spread.
All this is approximate, but can be quite useful
 |
 Jewelry Ring Sizer Measure Stick Mandrel Ring Finger Sizing Combination N7 $9.95 Time Remaining: 42m |
 Plastic Grey Finger Gauge Ring sizer Size 43 74 Jeweler Sizing Measuring Tool $0.99 Time Remaining: 1h 15m |
 Ring Gauge Metal Finger Band Sizer Jewelry Tool Measure 0 13 $0.60 Time Remaining: 4h 22m |
 Ring Sizer Sizing Stick Finger Measuring Tool Combo $2.89 Time Remaining: 6h 28m Buy It Now for only: $5.99 |
 Gauge Ring Finger Jewelry measure sizer Sizing US 1 13 $1.00 Time Remaining: 16h 27m Buy It Now for only: $1.00 |
 Ring Sizer StickGauge Sz 1 15 Finger Measuring Tool $7.99 Time Remaining: 17h 20m |
 Jewelry Ring Sizer Measure Stick Mandrel Ring Finger Sizing Combination P5 $9.95 Time Remaining: 19h 58m |
 Ring Sizer Sizing Stick Mandrel Finger Measuring $1.89 Time Remaining: 23h 37m Buy It Now for only: $3.69 |
 US Standard Metal Jewelry Measure Gauge Finger Ring Sizer Tool Size 1 to 13 New $6.51 Time Remaining: 1d 35m Buy It Now for only: $6.51 |
 Gauge Ring Finger Jewelry Measure Sizer Sizing US 0 13 $7.16 Time Remaining: 1d 2h 7m Buy It Now for only: $7.16 |
 Jewelry Ring Sizer Measure Stick Mandrel Ring Finger Sizing Combination T5 $9.95 Time Remaining: 1d 2h 44m |
 Ring Gauge Metal Finger Band Sizer Jewelry Tool Measure 0 13 $5.67 Time Remaining: 1d 3h 17m Buy It Now for only: $5.67 |
 Metal Finger Gauger Ring Sizer Jewelry Jeweler Measuring Tool US Size 0 13 $3.99 Time Remaining: 1d 5h 27m Buy It Now for only: $8.98 |
 Finger Ring Metal Sizer Measure Gauge Jewelry Size Tool $1.00 Time Remaining: 2d 49m Buy It Now for only: $1.00 |
 Finger Ring Metal Sizer Measure Gauge Jewelry Size Tool $6.79 Time Remaining: 2d 4h 9m Buy It Now for only: $6.79 |
 Finger Ring Metal Sizer Measure Gauge Jewelry Size Tool $1.00 Time Remaining: 2d 17h 24m Buy It Now for only: $1.00 |
 US Standard Metal Jewelry Measure Gauge Finger Ring Sizer Tool Size 1 to 13 New $0.99 Time Remaining: 2d 18h 51m |
 Ring Gauge Metal Finger Band Sizer Jewelry Tool Measure $19.90 Time Remaining: 2d 19h 34m |
 Ring Sizer Finger Sizing Measuring Kit FREE S H $12.59 Time Remaining: 2d 19h 40m Buy It Now for only: $12.59 |
 Jewelry Ring Sizer Measure Stick Mandrel Ring Finger Sizing Combination P7 $9.95 Time Remaining: 2d 19h 58m |
 Jewelry Ring Sizer Measure Stick Mandrel Ring Finger Sizing Combination T7 $9.95 Time Remaining: 3d 2h 44m |
 Finger Ring Metal Sizer Measure Gauge Jewelry Size Tool $7.59 Time Remaining: 4d 2h 27m Buy It Now for only: $7.59 |
 Ring Sizer Mandrel Finger Sizing Measuring Kit $8.99 Time Remaining: 4d 17h 35m |
 Finger Ring Metal Sizer Measure Gauge Jewelry Size Tool $1.00 Time Remaining: 5d 2h 52m Buy It Now for only: $1.00 |
 Jewelry Ring Sizer Measure Stick Mandrel Ring Finger Sizing Combination P3 $9.95 Time Remaining: 5d 21h 42m Buy It Now for only: $9.95 |
 Gauge Ring Finger Jewelry Measure Sizer Sizing US 0 13 $3.16 Time Remaining: 6d 5h Buy It Now for only: $3.16 |
 Gauge Ring Finger Jewelry Measure Sizer Sizing US 0 13 $5.03 Time Remaining: 7d 2h 11m Buy It Now for only: $5.03 |
 Ring Gauge Metal Finger Band Sizer Jewelry Tool Measure 0 13 $2.92 Time Remaining: 7d 2h 12m Buy It Now for only: $2.92 |
 Ring Gauge Metal Finger Band Sizer Jewelry Tool Measure 0 13 $1.00 Time Remaining: 7d 3h 6m Buy It Now for only: $1.00 |
 Copper Finger Ring Sizing Sizer Size Mandrel Gauge Jewelry Measuring Tool 1 13 $13.90 Time Remaining: 7d 4h 2m Buy It Now for only: $13.90 |
 Plastic Black UK Finger Sizer Ring Gauge L W 12 Jewelry Measure Sizing Tool $4.25 Time Remaining: 7d 4h 36m Buy It Now for only: $4.25 |
 Gauge Ring Finger Jewelry Measure Sizer Sizing US 0 13 $2.57 Time Remaining: 7d 4h 55m Buy It Now for only: $2.57 |
 Plastic Ring Finger Sizer Gauge L W 3 13 Measure Sizing Tool Wedding Jewelry $0.98 Time Remaining: 7d 20h 16m Buy It Now for only: $0.98 |
 Ring Finger Ring Stick Combo Kit Jewelry Sizer measure $5.55 Time Remaining: 7d 21h 11m Buy It Now for only: $5.55 |
 Finger Ring Metal Sizer Measure Gauge Jewelry Size Tool $7.59 Time Remaining: 8d 2h 22m Buy It Now for only: $7.59 |
 Ring Gauge Metal Finger Band Sizer Jewelry Tool Measure $18.90 Time Remaining: 8d 19h 55m Buy It Now for only: $18.90 |
 Gauge Ring Finger Jewelry Measure Sizer Sizing US 0 13 $7.16 Time Remaining: 9d 23h 12m Buy It Now for only: $7.16 |
 Ring Sizer Stick Mandrel Sz A Z Finger Measuring Tool $4.99 Time Remaining: 10d 5h 18m Buy It Now for only: $4.99 |
 Ring Gauge Metal Finger Band Sizer Jewelry Tool Measure 0 13 $4.59 Time Remaining: 11d 5h 41m Buy It Now for only: $4.59 |
 RING FINGER JEWELRY GAUGE SIZER MEASURING TOOL SZ 1 13 $2.99 Time Remaining: 12d 20h 23m Buy It Now for only: $2.99 |
 Ring Sizer Stick Sz 1 15 Finger Gauge Measuring Tool $5.88 Time Remaining: 12d 21h 22m Buy It Now for only: $5.88 |
 Ring Gauge Metal Finger Band Sizer Jewelry Tool Measure 0 13 $4.67 Time Remaining: 13d 7h 19m Buy It Now for only: $4.67 |
 Plastic Ring Sizer Gauge Tool for Measuring Fingers for Rings USA Sizes 1 15 1 2 $3.09 Time Remaining: 13d 14h 55m Buy It Now for only: $3.09 |
 29Pc Metal Ring Finger Sizer Gauge Measure Size of Band Wedding Jewelry 1 15 1 2 $11.95 Time Remaining: 13d 22h 58m Buy It Now for only: $11.95 |
 Plastic Finger Gauges for Measuring Ring Sizes $1.49 Time Remaining: 14d 18h 9m Buy It Now for only: $1.49 |
 Ring Sizer StickGauge Sz 1 15 Finger Measuring Tool $7.99 Time Remaining: 15d 18h 31m Buy It Now for only: $7.99 |
 Finger Ring Gauge Sizer Stick Measurement UK US Size Measure Tool $0.99 Time Remaining: 16d 3h 18m Buy It Now for only: $0.99 |
 Plastic White Ring Finger Sizer Gauge L W Measure Sizing Tool Wedding Jewelry $4.29 Time Remaining: 16d 14h 9m Buy It Now for only: $4.29 |
 Plastic Grey Finger Gauge Ring sizer Size 43 74 Jeweler Sizing Measuring Tool $5.99 Time Remaining: 16d 14h 9m Buy It Now for only: $5.99 |
 Ring Sizer Metal Gauger Finger Measure Tool US Sz 1 13 $3.99 Time Remaining: 16d 16h Buy It Now for only: $3.99 |
 Metal Finger Gauger Ring Sizer Jewelry Measuring Tool US Size 0 13 $9.99 Time Remaining: 16d 16h Buy It Now for only: $9.99 |
September 9th, 2010 in
Jewelry Repair | tags: apps, copd,, finger, gauge, measure, oximeter,, ring finger measuring chart, ringsize, science, shopping, smart finger measuring, smart finger measuring device, smart finger measuring thimbles