private async void LoadPoints()
        {
            var todaysData = await sunnyPortal.GetHistoricalDailyData(DateTime.Today);

            var points = new List <DataPoint>();

            var i = 0;

            foreach (var item in todaysData)
            {
                points.Add(new DataPoint(i++, item.Value));
            }

            PreparePlot(points);
        }