Noon to Noon As Opposed to Midnight to Midnight?

[Wotname]

I also honour this thread as having the best thread drift of all time, I note none of us have even tried to answer the OP's question, surely a record...

[El Pinguino]

OK...lets try again...

The time of 'Noon' or 'Meridian Passage' changes on a daily basis when related to 'clock time' ( whether that 'clock time' is GMT, PMT, UTC, Ship's Time, Zone Time or Liberian Standard Time) due to the nature of the earth's orbit around the sun.
This change can be seen by inspecting the 'Equation of Time' information on the daily pages of the Nautical Almanac and over the course of a year can see the true sun running up to 15 minutes ahead or behind the mean sun.

Is that better?

Ping aka Vasco Pyjamas

Thread drift ? I see no thread drift ... ( putting blunt end of rum bottle to bung eye.....)

[nohal]

Well, before I start to code this, can you guys come to an agreement as to whether you want to cut the track at "noon" (or any other time your preferred industry uses) according to the computer time, zonal time, UTC or exact local time? Or all of them, configurable, so that more people can yell at us that we are making OpenCPN too complicated to use?

Pavel

[Pelagic]

Originally Posted by GWB

Is there a way to display tracks this way (noon to noon)?
Thanks

Oh yeah.....the original question!...:what:

I coulda swore there was something in there about "high" noon.......

[rgleason]

Pelagic, I thought you had no use for OpenCPN. [If I am mistaken, I must have read something cryptic that I did not understand. If so please accept my apology.]

[Pelagic]

Guilty of being too cryptic sometimes....:sly:

More accurate to say...I haven't personally used OpenCPN on passages, so am more ignorant about its pros and cons.

[Harter]

Originally Posted by nigel1

Unless you work in the oil industry at sea. For some reason, they all want figures and distances based on midnight to midnight.

I can answer this one, Being a oilfield worker, costs are day rate, new day for the oilfield starts after midnight, so all footage and costs are recorded at that time,

[nigel1]

Originally Posted by Harter

I can answer this one, Being a oilfield worker, costs are day rate, new day for the oilfield starts after midnight, so all footage and costs are recorded at that time,

Still does not help my engineers who have to go and record fuel consumption at midnight (very unsociable), which is why the midnight figures are just a flog of the proper noon figures.

[bcn]

Originally Posted by nohal

Well, before I start to code this, can you guys come to an agreement as to whether you want to cut the track at "noon" (or any other time your preferred industry uses) according to the computer time, zonal time, UTC or exact local time? Or all of them, configurable, so that more people can yell at us that we are making OpenCPN too complicated to use?

Pavel

As you will have to check for a specific hour anyhow, why not defined by user?
Making it equivalent to the route properties perhaps? Where you have the option for UTC, PC, Local already..

And as you are tackling the tracks: a tick mark every hour (with time stamp) would be a nice thing

Hubert

[Wotname]

Originally Posted by El Pinguino

OK...lets try again...

The time of 'Noon' or 'Meridian Passage' changes on a daily basis when related to 'clock time' ( whether that 'clock time' is GMT, PMT, UTC, Ship's Time, Zone Time or Liberian Standard Time) due to the nature of the earth's orbit around the sun.
This change can be seen by inspecting the 'Equation of Time' information on the daily pages of the Nautical Almanac and over the course of a year can see the true sun running up to 15 minutes ahead or behind the mean sun.

Is that better?

Ping aka Vasco Pyjamas

Thread drift ? I see no thread drift ... ( putting blunt end of rum bottle to bung eye.....)

The Navigators Guild appointed a special committee of retired Sea Lords to consider your discretions and considering your subsequent apparent true knowledge and speedy redress of your shortcomings, the committee has recommended your immediate return to the Navigators table however it will be known that you will be ringing the bell for first tipples on the eve of midsummer.

[nohal]

Everybody happy?


Pavel

[bcn]

[PjotrC]

Just a comment...

The original idea of daily tracks had nothing to do with any bookkeeping. It was just a technical measure to prevent having tracks that become unmanageably long (with tracking always on), or - alternatively - having too many little tracks segments (with tracking on/off often, e.g. to save on laptop power).

I considered various approaches, including size-based cutoff, and traditional noon-noon as well. Eventually, I thought that cruising life rhythm is nowadays more often related to calendar dates, than to noon sights (sigh), both in coastal hopping and in long stretches.

In practice, after completing a passage I join (Extend, and perhaps Reduce Data, if nothing interesting happens) daily tracks into a harbour-to-harbour track. So ideally, the cutoff might also be manual or logbook driven, as long as there is no danger of the track growing too long...

With the automatic daily tracks, I can just defer the cleaning up until a convenient time.

Keep trackin'

Piotr