It is based on Ben Sugerman's Limiting MagnitudeĬalculations page. (The brightness of the faintest star a standard observer can see straight up.) Mouse over a darkness block for details. The numbers are the visual limiting magnitude at the zenith. For those who prefer numbers, the scale is also calibrated. Deep blue means a partially illuminated moon or moon at low altitude. It shows when the sky will be dark,Īssuming no light pollution and a clear sky.īlack is a dark sky. The line labeled darkness is not a weather forecast. This video discusses the difference bettween tube currents and seeing from 24:23 to 34.06: on youtube. With an instrument smaller than 11 inches. You may also observe better seeing than predicted here when observing That is becauseĪnd ground seeing mimic true atmospheric seeing. Note also that you may observe worse seeing though your telescope than what a perfect seeing forecast would predict. Those triplet boxes for the same forecast map are showen linked as a reminder.Ī white block on the seeing line means that there was too much cloud (>80% cover) to calculate it. Seeing is forecast for 3-hour blocks, so triples of seeing blocks will show the same color. No computer model forecasts convective heating well, so consider the seeing forecasts for daytime The excellent-to-bad seeing scale is calibrated for instruments in the 11 to 14 inch range. It's because seeing is not very related to the Often good seeing occurs during poor transparency. This forecast attempts to predict turbulence and temperature differences that affect seeing forīad seeing can occur during perfectly clear weather. Turbulence combined with temperature differences in the atmosphere. Planets might look like they are under a layer of rippling water and show little detail at any magnification, but the view of galaxies is The line, labeled Seeing, forecasts astronomical seeing. So see the separate smoke forecast line on this chart.ĬMC's text page explaining the transparency forecast is So it mayīe possible to observe during a white transparency forecast, but the real transparency is usually yucky. Large globulars and planets can be observed in poorĪ forecast color of white formally means that CMC didn't compute the transparency forecast because the cloud cover was over 30%. However, open clustersĪnd planetary nebulae are quite observable in below average transparency. It is somewhat independant of the cloud cover forecast in that there can be isolated clouds in a transparent air mass, and poor transparency can occurĪbove average transparency is necessary for good observation of low contrast objects like galaxies and nebulae. It's calculated from the total amount of water vapor in theĪir. The total transparency of the atmosphere from ground to space. Here 'transparency' means just what astronomers mean The line, labeled Transparency, forecasts the transparency of the air. It's always wise to click on a colored block for the hour you want to observe and see if your location is close to a cloud edge.ĬMC's text page explaining this forecast is Is 76% and the mostly-cloudy accuracy is 89%. When the forecast is predicting 36 to 48 hours into the future, the mostly-clear accuracy Mostly-clear forecasts (cloud75%) have been When the forecast is clear, the sky may still be hazy, if the transparency forecast is poor.Īccuracy averaged over North America for a 30 day period: when the forecast is predicting less than 12 hours into the future, This forecast may miss low cloud and afternoon thunderstorms. Lighter shades of blue are increasing cloudiness and white is overcast. The colors are picked from what color the sky is likely to be, with The line, labeled Cloud Cover forecasts total cloud cover. Connected blocks mean one forecast calculation for several hours. (Local time for Parrsboro is -3.0 hours from GMT.) Single blocks mean separate forecast data for each hour. A digit 1 on top of a 3 means 13:00 or 1pm. The two numbers at the top of a column is the time. The colors of the blocks are the colors from CMC's forecast maps for that hour. Summary: In the rows labeled "Sky", find a column of blue blocks. Summarizes CMC's forecast images just for ParrsboroĪnd the surroundings out to about 15 Kms. So, Attilla Danko wrote a script to generate the images like the one above It can be a chore to find the one map that tells you if you can observe tonight. CMC's numerical weather forecasts are unique because they are specifically designed for astronomers.īut they have 1180 forecast maps. The data comes from a forecast model developed by Allan Rahill of theĬanadian Meteorological Centre. It's a prediction of when Parrsboro, NS, will have good weather for astronomical observing. At a glance, it shows when it will be cloudy or clear for the
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Based on our experience with their accounting system we expect this to be a really good service but if you have used it yourself we would love to hear from you! From what we know the service is pretty similar to Label Worx, it offers a cost effective way to send promos to your list(s) of DJ’s, gather feedback and analyse results. We actually use Label Engine all the time for their brilliant Accounting System which helps us create royalty statements, manage licenses, invoices etc but we will come on to that in another article soon! We have not actually used their promo sender to send any campaigns but we have received some and taken a look around the back-end. It will be interesting to see if their competitors follow suit. InFlyte have really upped the technology behind sending promos and are we think they are on to something pretty exciting. This is a really slick solution for sending promos, especially if your mailing list includes busy international DJ’s who travel a lot as it allows them to check out the latest promos and line them up for their set’s while flying. They can check previews on their phone or tablet (even offline) and decide which promos they would like to download directly to their Dropbox account the next time they connect to the internet. Their app allows DJ’s to receive promos on the move. InFlyte is designed as a mobile-first service. While we have not actually used the service ourselves yet we have met the founders a few times and had a good look at the product. InFlyte offers a bit of a different solution for sending promos to DJ’s. Label Worx charge £7.50 / promo campaign. I’ve had no real issues using Label Worx and much prefer their pricing model to a monthly subscription but I would say that our open-rate has always been a little lower with Label Worx than it has been with FatDrop. Feedback from DJ’s is also easy to find and export. The analytics offered after campaigns are sent are in-depth and easy to understand. This pricing model may suit labels with a less regular output or those that sometimes use radio pluggers or other pr services. Label Worx offer a flat fee / release no matter how many times you send the tracks out or how much they are downloaded / streamed. The Promo Box app makes it easier for the DJ’s to organise and download their promos to their preferred cloud storage. It’s trusted by several top labels and also boasts ‘promo box’ which is a fully native mobile promo app and gives DJ’s the ability to flag tracks and send to various cloud areas such as DropBox, Google Drive etc. It works in a pretty similar way to FatDrop and has been running for over 7 Years. Label Worx offer a range of tools for labels and artists but they are perhaps best known for their promo sender. Setting up a Fatdrop account costs £50 with a monthly fee starting at £35/month. For more established labels and those willing to spend a little more this is a serious option. Having said that, you get what you pay for and there is no question the system is very reliable, professional and the customer service is brilliant. The slight down-side to the product is the price, it’s a little more expensive than most of it’s rivals and the pricing based on bandwidth used seems out of date and a little over the top. One of the huge benefits of the system is that DJ’s seem to love receiving the promos as they come in a standard format, can be streamed before downloading and look great. We have used FatDrop in the past for several promo campaigns and have always been impressed by it’s ease of use. Their impressive online system makes it very simple to manage lists of DJ’s, send promos, protect music from being shared, gather feedback and get in depth analytics. If you think there is something better out there we would love to hear from you so please do leave a comment or tweet is considered by many to be the industry standard. This is not a sponsored post and all opinions are my own. Here are 5 of the main services used for sending promos and the experience I have personally had with them. I hope this article can provide some useful information for anyone planning on starting a label or just getting their music heard. Having worked as a Label Manager, in PR and of course receiving hundreds of promos from DJ’s and producers hoping to be featured on the music section of I have a fair amount of experience in both sending & receiving promos. |